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Elasticsearch File System Crawler (FS Crawler)

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FileSystem Crawler for Elasticsearch

Welcome to the FS Crawler for Elasticsearch

This crawler helps to index documents from your local file system and over SSH. It crawls your file system and index new files, update existing ones and removes old ones.

You need to install a version matching your Elasticsearch version:

Elasticsearch FS Crawler Released Docs
2.x, 5.x, 6.x 2.5-SNAPSHOT See below
2.x, 5.x, 6.x 2.4 2017-08-11 2.4
2.x, 5.x, 6.x 2.3 2017-07-10 2.3
1.x, 2.x, 5.x 2.2 2017-02-03 2.2
1.x, 2.x, 5.x 2.1 2016-07-26 2.1
es-2.0 2.0.0 2015-10-30 2.0.0

Build and Quality Status

Maven Central Dependency Status Travis Lines Technical Debt Vulnerabilities Bugs Blocker Violations Critical Violations Code Smells Coverage

Table of content

Installation Guide

Download fscrawler

FS Crawler binary is available on Maven Central. Just download the latest release (or any other specific version you want to try).

The filename ends with .zip.

For example, if you wish to download fscrawler-2.4:

wget https://repo1.maven.org/maven2/fr/pilato/elasticsearch/crawler/fscrawler/2.4/fscrawler-2.4.zip
unzip fscrawler-2.4.zip

The distribution contains:

$ tree
.
├── LICENSE
├── NOTICE
├── README.md
├── bin
│   ├── fscrawler
│   └── fscrawler.bat
└── lib
    ├── ... All needed jars

Note that you can also download a SNAPSHOT version from sonatype without needing to build it by yourself.

Upgrade fscrawler

It can happen that you need to upgrade a mapping before starting fscrawler after a version upgrade. Read carefully the following update instructions.

To update fscrawler, just download the new version, unzip it in another directory and launch it as usual. It will still pick up settings from the configuration directory. Of course, you need to stop first the existing running instances.

Upgrade to 2.2

  • fscrawler comes with new default mappings for files. They have better defaults as they consume less disk space and CPU at index time. You should remove existing files in ~/.fscrawler/_default/_mappings before starting the new version so default mappings will be updated. If you modified manually mapping files, apply the modification you made on sample files.

  • excludes is now set by default for new jobs to ["~*"]. In previous versions, any file or directory containing a ~ was excluded. Which means that if in your jobs, you are defining any exclusion rule, you need to add *~* if you want to get back the exact previous behavior.

  • If you were indexing json or xml documents with the filename_as_id option set, we were previously removing the suffix of the file name, like indexing 1.json was indexed as 1. With this new version, we don't remove anymore the suffix. So the _id for your document will be now 1.json.

Upgrade to 2.3

  • fscrawler comes with new mapping for folders. The change is really tiny so you can skip this step if you wish. We basically removed name field in the folder mapping as it was unused.

  • The way FSCrawler computes now path.virtual for docs has changed. It now includes the filename. Instead of /path/to you will now get /path/to/file.txt.

  • The way FSCrawler computes now virtual for folders is now consistent with what you can see for folders.

  • path.encoded in documents and encoded in folders have been removed as not needed by FSCrawler after all.

  • OCR is now properly activated for PDF documents. This can be time, cpu and memory consuming though. You can disable explicitly it by setting fs.pdf_ocr to false.

  • All dates are now indexed in elasticsearch in UTC instead of without any time zone. For example, we were indexing previously a date like 2017-05-19T13:24:47.000. Which was producing bad results when you were located in a time zone other than UTC. It's now indexed as 2017-05-19T13:24:47.000+0000.

  • In order to be compatible with the coming 6.0 elasticsearch version, we need to get rid of types as only one type per index is still supported. Which means that we now create index named job_name and job_name_folder instead of one index job_name with two types doc and folder. If you are upgrading from FSCrawler 2.2, it requires that you reindex your existing data either by deleting the old index and running again FSCrawler or by using the reindex API as follows:

# Create folder index job_name_folder based on existing folder data
POST _reindex
{
  "source": {
    "index": "job_name",
    "type": "folder"
  },
  "dest": {
    "index": "job_name_folder"
  }
}
# Remove old folder data from job_name index
POST job_name/folder/_delete_by_query
{
  "query": {
    "match_all": {}
  }
}

Note that you will need first to create the right settings and mappings so you can then run the reindex job. You can do that by launching bin/fscrawler job_name --loop 0.

Better, you can run bin/fscrawler job_name --upgrade and let FSCrawler do all that for you. Note that this can take a loooong time.

Also please be aware that some APIs used by the upgrade action are only available from elasticsearch 2.3 (reindex) or elasticsearch 5.0 (delete by query). If you are running an older version than 5.0 you need first to upgrade elasticsearch.

This procedure only applies if you did not set previously elasticsearch.type setting (default value was doc). If you did, then you also need to reindex the existing documents to the default doc type as per elasticsearch 6.0:

# Copy old type doc to the default doc type
POST _reindex
{
  "source": {
    "index": "job_name",
    "type": "your_type_here"
  },
  "dest": {
    "index": "job_name",
    "type": "doc"
  }
}
# Remove old type data from job_name index
POST job_name/your_type_here/_delete_by_query
{
  "query": {
    "match_all": {}
  }
}

But note that this last step can take a very loooong time and will generate a lot of IO on your disk. It might be easier in such case to restart fscrawler from scratch.

  • As seen in the previous point, we now have 2 indices instead of a single one. Which means that elasticsearch.index setting has been split to elasticsearch.index and elasticsearch.index_folder. By default, it's set to the crawler name and the crawler name plus _folder. Note that the upgrade feature performs that change for you.

  • fscrawler has removed now mapping files doc.json and folder.json. Mapping for doc is merged within _settings.json file and folder mapping is now part of _settings_folder.json. Which means you can remove old files to avoid confusion. You can simply remove existing files in ~/.fscrawler/_default before starting the new version so default files will be created again.

Upgrade to 2.4

  • No specific step needed. Just note that mapping changed as we support more metadata. Might be useful to run similar steps as for 2.2 upgrade.

Upgrade to 2.5

  • A bug was causing a lot of data going over the wire each time FSCrawler was running. To fix this issue, we changed the default mapping and we set store: true on field file.filename. If this field is not stored and remove_deleted is true (default), FSCrawler will fail while crawling your documents. You need to create the new mapping accordingly and reindex your existing data either by deleting the old index and running again FSCrawler or by using the reindex API as follows:
# Backup old index data
POST _reindex
{
  "source": {
    "index": "job_name"
  },
  "dest": {
    "index": "job_name_backup"
  }
}
# Remove job_name index
DELETE job_name

Restart FSCrawler with the following command. It will just create the right mapping again.

$ bin/fscrawler job_name --loop 0

Then restore old data:

POST _reindex
{
  "source": {
    "index": "job_name_backup"
  },
  "dest": {
    "index": "job_name"
  }
}
# Remove backup index
DELETE job_name_backup

The default mapping changed for FSCrawler for meta.raw.* fields. Might be better to reindex your data.

User Guide

Getting Started

You need to have at least Java 1.8. and have properly configured JAVA_HOME to point to your Java installation directory. For example on MacOS you can define in your ~/.bash_profile file:

export JAVA_HOME=`/usr/libexec/java_home -v 1.8`

Start FS crawler with:

bin/fscrawler job_name

FS crawler will read a local file (default to ~/.fscrawler/{job_name}/_settings.json). If the file does not exist, FS crawler will propose to create your first job.

$ bin/fscrawler job_name
18:28:58,174 WARN  [f.p.e.c.f.FsCrawler] job [job_name] does not exist
18:28:58,177 INFO  [f.p.e.c.f.FsCrawler] Do you want to create it (Y/N)?
y
18:29:05,711 INFO  [f.p.e.c.f.FsCrawler] Settings have been created in [~/.fscrawler/job_name/_settings.json]. Please review and edit before relaunch

Create a directory named /tmp/es or c:\tmp\es, add some files you want to index in it and start again:

$ bin/fscrawler --config_dir ./test job_name
18:30:34,330 INFO  [f.p.e.c.f.FsCrawlerImpl] Starting FS crawler
18:30:34,332 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler started in watch mode. It will run unless you stop it with CTRL+C.
18:30:34,682 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler started for [job_name] for [/tmp/es] every [15m]

If you did not create the directory, FS crawler will complain until you fix it:

18:30:34,683 WARN  [f.p.e.c.f.FsCrawlerImpl] Error while indexing content from /tmp/es: /tmp/es doesn't exists.

You can also run FS crawler without arguments. It will give you the list of existing jobs and will allow you to choose one:

$ bin/fscrawler
18:33:00,624 INFO  [f.p.e.c.f.FsCrawler] No job specified. Here is the list of existing jobs:
18:33:00,629 INFO  [f.p.e.c.f.FsCrawler] [1] - job_name
18:33:00,629 INFO  [f.p.e.c.f.FsCrawler] Choose your job [1-1]...
1
18:33:06,151 INFO  [f.p.e.c.f.FsCrawlerImpl] Starting FS crawler

Searching for docs

This is a common use case in elasticsearch, we want to search for something! ;-)

GET docs/doc/_search
{
  "query" : {
    "match" : {
        "_all" : "I am searching for something !"
    }
  }
}

Crawler options

By default, FS crawler will read your file from /tmp/es every 15 minutes. You can change those settings by modifying ~/.fscrawler/{job_name}/_settings.json file where {job_name} is the name of the job you just created.

{
  "name" : "job_name",
  "fs" : {
    "url" : "/path/to/data/dir",
    "update_rate" : "15m"
  }
}

You can change also update_rate to watch more or less frequently for changes.

If you just want FS crawler to run once and exit, run it with --loop option:

$ bin/fscrawler job_name --loop 1
18:47:37,487 INFO  [f.p.e.c.f.FsCrawlerImpl] Starting FS crawler
18:47:37,854 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler started for [job_name] for [/tmp/es] every [15m]
...
18:47:37,855 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler is stopping after 1 run
18:47:37,959 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler [job_name] stopped

If you have already ran FS crawler and want to restart (which means reindex existing documents), use the --restart option:

$ bin/fscrawler job_name --loop 1 --restart

You will find more information about settings in the following sections:

Starting with a REST gateway

FS crawler can be a nice gateway to elasticsearch if you want to upload binary documents and index them into elasticsearch without writing by yourself all the code to extract data and communicate with elasticsearch.

To start FS crawler with the REST service, use the --rest option. A good idea is also to combine it with --loop 0 so you won't index local files but only listen to incoming REST requests:

$ bin/fscrawler job_name --loop 0 --rest
18:55:37,851 INFO  [f.p.e.c.f.FsCrawlerImpl] Starting FS crawler
18:55:39,237 INFO  [f.p.e.c.f.FsCrawlerImpl] FS crawler Rest service started on [http://127.0.0.1:8080/fscrawler]

Check the service is working with:

curl http://127.0.0.1:8080/fscrawler/

It will give you back a JSON document.

The you can start uploading your binary files:

echo "This is my text" > test.txt
curl -F "file=@test.txt" "http://127.0.0.1:8080/fscrawler/_upload"

It will index the file into elasticsearch and will give you back the elasticsearch URL for the created document, like:

{
  "ok" : true,
  "filename" : "test.txt",
  "url" : "http://127.0.0.1:9200/fscrawler-rest-tests_doc/doc/dd18bf3a8ea2a3e53e2661c7fb53534"
}

You will find more information about REST settings in the following section:

Supported formats

FS crawler supports all formats Tika version 1.17 supports, like:

  • HTML
  • Microsoft Office
  • Open Office
  • PDF
  • Images
  • MP3
  • ...

Administration guide

Once the crawler is running, it will write status information and statistics in:

  • ~/.fscrawler/{job_name}/_settings.json
  • ~/.fscrawler/{job_name}/_status.json

It means that if you stop the job at some point, FS crawler will restart it from where it stops.

FS crawler will also store default mappings and index settings for elasticsearch in ~/.fscrawler/_default/_mappings:

  • 1/_settings.json: for elasticsearch 1.x series document index settings
  • 1/_settings_folder.json: for elasticsearch 1.x series folder index settings
  • 2/_settings.json: for elasticsearch 2.x series document index settings
  • 2/_settings_folder.json: for elasticsearch 2.x series folder index settings
  • 5/_settings.json: for elasticsearch 5.x series document index settings
  • 5/_settings_folder.json: for elasticsearch 5.x series folder index settings
  • 6/_settings.json: for elasticsearch 6.x series document index settings
  • 6/_settings_folder.json: for elasticsearch 6.x series folder index settings

Read Mapping for more information.

CLI options

  • --help displays help

  • --silent runs in silent mode. No output is generated.

  • --debug runs in debug mode.

  • --trace runs in trace mode (more verbose than debug).

  • --config_dir defines directory where jobs are stored instead of default ~/.fscrawler.

  • --username defines the username to use when using an secured version of elasticsearch cluster. Read Using Credentials. (From 2.2)

  • --upgrade_mapping tries to upgrade existing mappings for documents and folders. Read Upgrading an existing mapping. (From 2.2)

  • --loop x defines the number of runs we want before exiting (From 2.2):

    • X where X is a negative value means infinite, like -1 (default)
    • 0 means that we don't run any crawling job (useful when used with rest).
    • X where X is a positive value is the number of runs before it stops.

If you want to scan your hard drive only once, run with --loop 1.

  • --restart restart a job from scratch (From 2.2). See below.
  • --rest starts the REST service (From 2.2):

If you want to run the REST Service without scanning your hard drive, launch with:

bin/fscrawler --rest --loop 0

You can tell FS crawler that it must restart from the beginning by using --restart option:

bin/fscrawler job_name --restart

In that case, the {job_name}/_status.json file will be removed.

JVM Settings

If you want to provide JVM settings, like defining memory allocated to FS Crawler, you can define a system property named FS_JAVA_OPTS:

FS_JAVA_OPTS="-Xmx521m -Xms521m" bin/fscrawler

Configuring an external logger configuration file

If you want to define an external log4j2.xml file, you can use the log4j.configurationFile JVM parameter which you can define in FS_JAVA_OPTS variable if you wish:

FS_JAVA_OPTS="-Dlog4j.configurationFile=path/to/log4j2.xml" bin/fscrawler

You can use the default log4j2.xml file as an example to start with.

Job file specification

The job file must comply to the following json specifications:

{
  "name" : "job_name",
  "fs" : {
    "url" : "/path/to/docs",
    "update_rate" : "5m",
    "includes" : [ "*.doc", "*.xls" ],
    "excludes" : [ "resume.doc" ],
    "json_support" : false,
    "filename_as_id" : true,
    "add_filesize" : true,
    "remove_deleted" : true,
    "add_as_inner_object" : false,
    "store_source" : true,
    "index_content" : true,
    "indexed_chars" : "10000.0",
    "attributes_support" : false,
    "raw_metadata" : true,
    "xml_support" : false,
    "index_folders" : true,
    "lang_detect" : false,
    "continue_on_error" : false,
    "pdf_ocr" : true,
    "ocr" : {
      "language" : "eng",
      "path": "/path/to/tesseract/if/not/available/in/PATH",
      "data_path": "/path/to/tesseract/tessdata/if/needed"
    }
  },
  "server" : {
    "hostname" : "localhost",
    "port" : 22,
    "username" : "dadoonet",
    "password" : "password",
    "protocol" : "SSH",
    "pem_path" : "/path/to/pemfile"
  },
  "elasticsearch" : {
    "nodes" : [ {
      "host" : "127.0.0.1",
      "port" : 9200,
      "scheme" : "HTTP"
    } ],
    "index" : "docs",
    "bulk_size" : 1000,
    "flush_interval" : "5s",
    "username" : "elastic",
    "password" : "password"
  },
  "rest" : {
    "scheme" : "HTTP",
    "host" : "127.0.0.1",
    "port" : 8080,
    "endpoint" : "fscrawler"
  }
}

Here is a list of existing top level settings:

Name Documentation
name the job name (mandatory field)
fs Local FS settings
elasticsearch Elasticsearch settings
server SSH settings
rest REST settings

The most simple crawler

You can define the most simple crawler job by writing a ~/.fscrawler/test/_settings.json file as follow:

{
  "name" : "test"
}

This will scan every 15 minutes all documents available in /tmp/es dir and will index them into test_doc index. It will connect to an elasticsearch cluster running on 127.0.0.1, port 9200.

Note: name is a mandatory field.

Local FS settings

Here is a list of Local FS settings (under fs. prefix)`:

Name Default value Documentation
fs.url "/tmp/es" Root directory
fs.update_rate "15m" Update Rate
fs.includes null Includes and Excludes
fs.excludes ["~*"] Includes and Excludes
fs.json_support false Indexing JSon docs
fs.xml_support false Indexing XML docs (from 2.2)
fs.add_as_inner_object false Add as Inner Object
fs.index_folders true Index folders (from 2.2)
fs.attributes_support false Adding file attributes
fs.raw_metadata true Disabling raw metadata
fs.filename_as_id false Using Filename as _id
fs.add_filesize true Disabling file size field
fs.remove_deleted true Ignore deleted files
fs.store_source false Storing binary source document
fs.index_content true Ignore content
fs.lang_detect false Language detection (from 2.2)
fs.continue_on_error false Continue on File Permission Error (from 2.3)
fs.pdf_ocr true Run OCR on PDF documents (from 2.3)
fs.indexed_chars 100000.0 Extracted characters
fs.checksum null File Checksum

Root directory

Define fs.url property in your ~/.fscrawler/test/_settings.json file:

{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir"
  }
}

For Windows users, use a form like c:/tmp or c:\\tmp.

Update rate

By default, update_rate is set to 15m. You can modify this value using any compatible time unit.

For example, here is a 15 minutes update rate:

{
  "name": "test",
  "fs": {
    "update_rate": "15m"
  }
}

Or a 3 hours update rate:

{
  "name": "test",
  "fs": {
    "update_rate": "3h"
  }
}

update_rate is the pause duration between the last time we read the file system and another run. Which means that if you set it to 15m, the next scan will happen on 15 minutes after the end of the current scan, whatever its duration.

Includes and excludes

Let's say you want to index only docs like *.doc and *.pdf but resume*. So resume_david.pdf won't be indexed.

Define fs.includes and fs.excludes properties in your ~/.fscrawler/test/_settings.json file:

{
  "name" : "test",
  "fs": {
    "includes": [
      "*.doc",
      "*.pdf"
    ],
    "excludes": [
      "resume*"
    ]
  }
}

It also applies to directory names. So if you want to ignore .ignore dir, just add .ignore as an excluded name. Note that includes does not apply to directory names but only to filenames.

By default, FS crawler will exclude files starting with ~.

Indexing JSon docs

If you want to index JSon files directly without parsing with Tika, you can set json_support to true. JSon contents will be stored directly under _source. If you need to keep JSon documents synchronized to the index, set option Add as Inner Object which stores additional metadata and the JSon contents under field object.

{
  "name" : "test",
  "fs" : {
    "json_support" : true
  }
}

Of course, if you did not define a mapping before launching the crawler, Elasticsearch will auto guess the mapping.

Indexing XML docs

If you want to index XML files and convert them to JSON, you can set xml_support to true. The content of XML files will be added directly under _source. If you need to keep XML documents synchronized to the index, set option Add as Inner Object which stores additional metadata and the XML contents under field object.

{
  "name" : "test",
  "fs" : {
    "xml_support" : true
  }
}

Of course, if you did not define a mapping before launching the crawler, Elasticsearch will auto guess the mapping.

Add as Inner Object

The default settings store the contents of json and xml documents directly onto the _source element of elasticsearch documents. Thereby, there is no metadata about file and path settings, which are necessary to determine if a document is deleted or updated. New files will however be added to the index, (determined by the file timestamp).

If you need to keep json or xml documents synchronized to elasticsearch, you should set this option.

{
  "name" : "test",
  "fs" : {
    "add_as_inner_object" : true
  }
}

Index folders

By default FS Crawler will index folder names in the folder index. If you don't want to index those folders, you can set index_folders to false.

Note that in that case, FS Crawler won't be able to detect removed folders so any document has been indexed in elasticsearch, it won't be removed when you remove or move the folder away.

{
  "name" : "test",
  "fs" : {
    "index_folders" : false
  }
}
Dealing with multiple types and multiple dirs

If you have more than one type, create as many crawlers as types:

~/.fscrawler/test_type1/_settings.json:

{
  "name": "test_type1",
  "fs": {
	"url": "/tmp/type1",
	"json_support" : true
  },
  "elasticsearch": {
    "index": "mydocs1",
    "index_folder": "myfolders1"
  }
}

~/.fscrawler/test_type2/_settings.json:

{
  "name": "test_type2",
  "fs": {
	"url": "/tmp/type2",
	"json_support" : true
  },
  "elasticsearch": {
    "index": "mydocs2",
    "index_folder": "myfolders2"
  }
}

~/.fscrawler/test_type3/_settings.json:

{
  "name": "test_type3",
  "fs": {
	"url": "/tmp/type3",
	"xml_support" : true
  },
  "elasticsearch": {
    "index": "mydocs3",
    "index_folder": "myfolders3"
  }
}
Dealing with multiple types within the same dir

You can also index many types from one single dir using two crawlers scanning the same dir and by setting includes parameter:

~/.fscrawler/test_type1.json:

{
  "name": "test_type1",
  "fs": {
	"url": "/tmp",
    "includes": [ "type1*.json" ],
	"json_support" : true
  },
  "elasticsearch": {
    "index": "mydocs1",
    "index_folder": "myfolders1"
  }
}

~/.fscrawler/test_type2.json:

{
  "name": "test_type2",
  "fs": {
	"url": "/tmp",
    "includes": [ "type2*.json" ],
	"json_support" : true
  },
  "elasticsearch": {
    "index": "mydocs2",
    "index_folder": "myfolders2"
  }
}

~/.fscrawler/test_type3.json:

{
  "name": "test_type3",
  "fs": {
	"url": "/tmp",
    "includes": [ "*.xml" ],
	"xml_support" : true
  },
  "elasticsearch": {
    "index": "mydocs3",
    "index_folder": "myfolders3"
  }
}

Using filename as elasticsearch _id

Please note that the document _id is always generated (hash value) from the filename to avoid issues with special characters in filename. You can force to use the _id to be the filename using filename_as_id attribute:

{
  "name" : "test",
  "fs" : {
    "filename_as_id" : true
  }
}

Adding file attributes

If you want to add file attributes such as attributes.owner and attributes.group, you can set attributes_support to true.

{
  "name" : "test",
  "fs" : {
    "attributes_support" : true
  }
}

Disabling raw metadata

By default, FS Crawler will extract all found metadata within meta.raw object. If you want to disable this feature, you can set raw_metadata to false.

{
  "name" : "test",
  "fs" : {
    "raw_metadata" : false
  }
}

Generated raw metadata depends on the file format itself.

For example, a PDF document could generate:

  • "date" : "2016-07-07T08:37:42Z"
  • "pdf:PDFVersion" : "1.5"
  • "xmp:CreatorTool" : "Microsoft Word"
  • "Keywords" : "keyword1, keyword2"
  • "access_permission:modify_annotations" : "true"
  • "access_permission:can_print_degraded" : "true"
  • "subject" : "Test Tika Object"
  • "dc:creator" : "David Pilato"
  • "dcterms:created" : "2016-07-07T08:37:42Z"
  • "Last-Modified" : "2016-07-07T08:37:42Z"
  • "dcterms:modified" : "2016-07-07T08:37:42Z"
  • "dc:format" : "application/pdf; version=1.5"
  • "title" : "Test Tika title"
  • "Last-Save-Date" : "2016-07-07T08:37:42Z"
  • "access_permission:fill_in_form" : "true"
  • "meta:save-date" : "2016-07-07T08:37:42Z"
  • "pdf:encrypted" : "false"
  • "dc:title" : "Test Tika title"
  • "modified" : "2016-07-07T08:37:42Z"
  • "cp:subject" : "Test Tika Object"
  • "Content-Type" : "application/pdf"
  • "X-Parsed-By" : "org.apache.tika.parser.DefaultParser"
  • "creator" : "David Pilato"
  • "meta:author" : "David Pilato"
  • "dc:subject" : "keyword1, keyword2"
  • "meta:creation-date" : "2016-07-07T08:37:42Z"
  • "created" : "Thu Jul 07 10:37:42 CEST 2016"
  • "access_permission:extract_for_accessibility" : "true"
  • "access_permission:assemble_document" : "true"
  • "xmpTPg:NPages" : "2"
  • "Creation-Date" : "2016-07-07T08:37:42Z"
  • "access_permission:extract_content" : "true"
  • "access_permission:can_print" : "true"
  • "meta:keyword" : "keyword1, keyword2"
  • "Author" : "David Pilato"
  • "access_permission:can_modify" : "true"

Where a MP3 file would generate:

  • "xmpDM:genre" : "Vocal"
  • "X-Parsed-By" : "org.apache.tika.parser.DefaultParser"
  • "creator" : "David Pilato"
  • "xmpDM:album" : "FS Crawler"
  • "xmpDM:trackNumber" : "1"
  • "xmpDM:releaseDate" : "2016"
  • "meta:author" : "David Pilato"
  • "xmpDM:artist" : "David Pilato"
  • "dc:creator" : "David Pilato"
  • "xmpDM:audioCompressor" : "MP3"
  • "title" : "Test Tika"
  • "xmpDM:audioChannelType" : "Stereo"
  • "version" : "MPEG 3 Layer III Version 1"
  • "xmpDM:logComment" : "Hello but reverted"
  • "xmpDM:audioSampleRate" : "44100"
  • "channels" : "2"
  • "dc:title" : "Test Tika"
  • "Author" : "David Pilato"
  • "xmpDM:duration" : "1018.775146484375"
  • "Content-Type" : "audio/mpeg"
  • "samplerate" : "44100"

The meta.raw.* fields have a default mapping applied:

{
  "type": "text",
  "fields": {
    "keyword": {
      "type": "keyword",
      "ignore_above": 256
    }
  }
}

If you want specifically tell elasticsearch to use a date type or a numeric type for some fields, you need to modify the default template provided by FSCrawler.

Note that dots in metadata names will be replaced by a :. For example PTEX.Fullbanner will be indexed as PTEX:Fullbanner.

Disabling file size field

By default, FS crawler will create a field to store the original file size in octets. You can disable it using `add_filesize' option:

{
  "name" : "test",
  "fs" : {
    "add_filesize" : false
  }
}

Ignore deleted files

If you don't want to remove indexed documents when you remove a file or a directory, you can set remove_deleted to false (default to true):

{
  "name" : "test",
  "fs" : {
    "remove_deleted" : false
  }
}

Ignore content

If you don't want to extract file content but only index filesystem metadata such as filename, date, size and path, you can set index_content to false (default to true):

{
  "name" : "test",
  "fs" : {
    "index_content" : false
  }
}

Continue on Error

By default FS Crawler will immediately stop indexing if he hits a Permission denied exception. If you want to just skip this File and continue with the rest of the directory tree you can set continue_on_error to true (default to false):

{
  "name" : "test",
  "fs" : {
    "continue_on_error" : true
  }
}

Language detection

From FS crawler 2.2, you can ask for language detection using lang_detect option:

{
  "name" : "test",
  "fs" : {
    "lang_detect" : true
  }
}

In that case, a new field named meta.language is added to the generated JSon document.

If you are using elasticsearch 5.0 or superior, you can use this value to send your document to a specific index using a Node Ingest pipeline.

For example, you can define a pipeline named langdetect with:

PUT _ingest/pipeline/langdetect
{
  "description" : "langdetect pipeline",
  "processors" : [
    {
      "set": {
        "field": "_index",
        "value": "myindex-{{meta.language}}"
      }
    }
  ]
}

In FS crawler settings, set both fs.lang_detect and elasticsearch.pipeline options:

{
  "name" : "test",
  "fs" : {
    "lang_detect" : true
  },
  "elasticsearch" : {
    "pipeline" : "langdetect"
  }
}

And then, a document containing french text will be sent to myindex-fr. A document containing english text will be sent to myindex-en.

You can also imagine changing the field name from content to content-fr or content-en. That will help you to define the correct analyzer to use.

Language detection might detect more than one language in a given text but only the most accurate will be set. Which means that if you have a document containing 80% of french and 20% of english, the document will be marked as fr.

Note that language detection is CPU and time consuming.

Storing binary source document (BASE64 encoded)

You can store in elasticsearch itself the binary document using store_source option:

{
  "name" : "test",
  "fs" : {
    "store_source" : true
  }
}

In that case, a new field named attachment is added to the generated JSon document. This field is not indexed. Default mapping for attachment field is:

{
  "doc" : {
    "properties" : {
      "attachment" : {
        "type" : "binary",
        "doc_values" : false
      }
      // ... Other properties here
    }
  }
}

Extracted characters

By default FS crawler will extract only the first 100 000 characters. But, you can set indexed_chars to 5000 in FS crawler settings in order to overwrite this default settings.

{
  "name": "test",
  "fs": {
    "indexed_chars": "5000"
  }
}

This number can be either a fixed size, number of characters that is, or a percent using % sign. The percentage value will be applied to the filesize to determine the number of character the crawler needs to extract.

If you want to index only 80% of filesize, define indexed_chars to "80%". Of course, if you want to index the full document, you can set this property to "100%". Double values are also supported so "0.01%" is also a correct value.

Compressed files: If your file is compressed, you might need to increase indexed_chars to more than "100%". For example, "150%".

If you want to extract the full content, define indexed_chars to "-1".

Note: Tika requires to allocate in memory a data structure to extract text. Setting indexed_chars to a high number will require more memory!

File checksum

If you want FS crawler to generate a checksum for each file, set checksum to the algorithm you wish to use to compute the checksum, such as MD5 or SHA-1.

{
  "name": "test",
  "fs": {
    "checksum": "MD5"
  }
}

SSH settings

You can index files remotely using SSH.

Here is a list of SSH settings (under server. prefix)`:

Name Default value Documentation
server.hostname null Hostname
server.port 22 Port
server.username null Username
server.password null Password
server.protocol "local" Set it to ssh
server.pem_path null Using Username / PEM file

Username / Password

Let's say you want to index from a remote server using SSH:

  • FS URL: /path/to/data/dir/on/server
  • Server: mynode.mydomain.com
  • Username: username
  • Password: password
  • Protocol: ssh (default to local)
  • Port: 22 (default to 22)
{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir/on/server"
  },
  "server" : {
    "hostname" : "mynode.mydomain.com",
    "port" : 22,
    "username" : "username",
    "password" : "password",
    "protocol" : "ssh"
  }
}

Using Username / PEM file

Let's say you want to index from a remote server using SSH:

  • FS URL: /path/to/data/dir/on/server
  • Server: mynode.mydomain.com
  • Username: username
  • PEM File: /path/to/private_key.pem
  • Protocol: ssh (default to local)
  • Port: 22 (default to 22)
{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir/on/server"
  },
  "server" : {
    "hostname" : "mynode.mydomain.com",
    "port" : 22,
    "username" : "username",
    "protocol" : "ssh",
	"pem_path": "/path/to/private_key.pem"
  }
}

Elasticsearch settings

Here is a list of Elasticsearch settings (under elasticsearch. prefix)`:

Name Default value Documentation
elasticsearch.index job name Index name for docs. See Index settings
elasticsearch.index_folder job name + _folder Index name for folders. See Index settings
elasticsearch.bulk_size 100 Bulk settings
elasticsearch.flush_interval "5s" Bulk settings
elasticsearch.pipeline null Using Ingest Node Pipeline (from 2.2)
elasticsearch.nodes http://127.0.0.1:9200 Node settings
elasticsearch.username null Username. See Using credentials (X-Pack) (from 2.2)
elasticsearch.password null Password. See Using credentials (X-Pack) (from 2.2)

Index settings

By default, FS crawler will index your data in an index which name is the same as the crawler name (name property) plus _doc suffix, like test_doc. You can change it by setting index field:

{
  "name" : "test",
  "elasticsearch" : {
    "index" : "docs"
  }
}

When FS crawler needs to create the doc index, it applies some default settings and mappings which are read from ~/.fscrawler/_default/5/_settings.json. You can read its content from the source.

Settings define an analyzer named fscrawler_path which uses a path hierarchy tokenizer.

FS crawler will also index folders in an index which name is the same as the crawler name (name property) plus _folder suffix, like test_folder. You can change it by setting index_folder field:

{
 "name" : "test",
 "elasticsearch" : {
   "index_folder" : "folders"
 }
}

FS crawler applies as well a mapping automatically which is read from ~/.fscrawler/_default/5/_settings_folder.json. Source here.

You can also display the index mapping being used with Kibana:

GET docs/_mapping

Or fall back to the command line:

curl 'http://localhost:9200/docs/_mapping?pretty'
Creating your own mapping (analyzers)

If you want to define your own index settings and mapping to set analyzers for example, you can either create the index and push the mapping or define a ~/.fscrawler/_default/5/_settings.json document which contains the index settings and mappings you wish before starting the FS crawler.

The following example uses a french analyzer to index the content field.

{
  "settings": {
    "index.mapping.total_fields.limit": 2000,
    "analysis": {
      "analyzer": {
        "fscrawler_path": {
          "tokenizer": "fscrawler_path"
        }
      },
      "tokenizer": {
        "fscrawler_path": {
          "type": "path_hierarchy"
        }
      }
    }
  },
  "mappings": {
    "doc": {
      "properties" : {
        "attachment" : {
          "type" : "binary",
          "doc_values": false
        },
        "attributes" : {
          "properties" : {
            "group" : {
              "type" : "keyword"
            },
            "owner" : {
              "type" : "keyword"
            }
          }
        },
        "content" : {
          "type" : "text",
          "analyzer" : "french"
        },
        "file" : {
          "properties" : {
            "content_type" : {
              "type" : "keyword"
            },
            "filename" : {
              "type" : "keyword"
            },
            "extension" : {
              "type" : "keyword"
            },
            "filesize" : {
              "type" : "long"
            },
            "indexed_chars" : {
              "type" : "long"
            },
            "indexing_date" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "last_modified" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "checksum": {
              "type": "keyword"
            },
            "url" : {
              "type" : "keyword",
              "index" : false
            }
          }
        },
        "object" : {
          "type" : "object"
        },
        "meta" : {
          "properties" : {
            "author" : {
              "type" : "text"
            },
            "date" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "keywords" : {
              "type" : "text"
            },
            "title" : {
              "type" : "text"
            },
            "language" : {
              "type" : "keyword"
            },
            "format" : {
              "type" : "text"
            },
            "identifier" : {
              "type" : "text"
            },
            "contributor" : {
              "type" : "text"
            },
            "coverage" : {
              "type" : "text"
            },
            "modifier" : {
              "type" : "text"
            },
            "creator_tool" : {
              "type" : "keyword"
            },
            "publisher" : {
              "type" : "text"
            },
            "relation" : {
              "type" : "text"
            },
            "rights" : {
              "type" : "text"
            },
            "source" : {
              "type" : "text"
            },
            "type" : {
              "type" : "text"
            },
            "description" : {
              "type" : "text"
            },
            "created" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "print_date" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "metadata_date" : {
              "type" : "date",
              "format" : "dateOptionalTime"
            },
            "latitude" : {
              "type" : "text"
            },
            "longitude" : {
              "type" : "text"
            },
            "altitude" : {
              "type" : "text"
            },
            "rating" : {
              "type" : "keyword"
            },
            "comments" : {
              "type" : "text"
            }
          }
        },
        "path" : {
          "properties" : {
            "real" : {
              "type" : "keyword",
              "fields": {
                "tree": {
                  "type" : "text",
                  "analyzer": "fscrawler_path",
                  "fielddata": true
                }
              }
            },
            "root" : {
              "type" : "keyword"
            },
            "virtual" : {
              "type" : "keyword",
              "fields": {
                "tree": {
                  "type" : "text",
                  "analyzer": "fscrawler_path",
                  "fielddata": true
                }
              }
            }
          }
        }
      }
    }
  }
}

Note that if you want to push manually the mapping to elasticsearch you can use the classic REST calls:

# Create index (don't forget to add the fscrawler_path analyzer)
PUT docs
{
  // Same index settings as previously seen
}
Define explicit mapping/settings per job

Let's say you created a job named job_name and you are sending documents against an elasticsearch cluster running version 5.x.

If you create the following files, they will be picked up at job start time instead of the default ones:

  • ~/.fscrawler/{job_name}/_mappings/5/_settings.json
  • ~/.fscrawler/{job_name}/_mappings/5/_settings_folder.json

You can do the same for other elasticsearch versions with:

  • ~/.fscrawler/{job_name}/_mappings/1/_settings.json for 1.x series
  • ~/.fscrawler/{job_name}/_mappings/1/_settings_folder.json for 1.x series
  • ~/.fscrawler/{job_name}/_mappings/2/_settings.json for 2.x series
  • ~/.fscrawler/{job_name}/_mappings/2/_settings_folder.json for 2.x series
  • ~/.fscrawler/{job_name}/_mappings/6/_settings.json for 6.x series
  • ~/.fscrawler/{job_name}/_mappings/6/_settings_folder.json for 6.x series
Replace existing mapping

Unfortunately you can not change the mapping on existing data. Therefore, you'll need first to remove existing index, which means remove all existing data, and then restart FS crawler with the new mapping.

You might to try elasticsearch Reindex API though.

Bulk settings

FS crawler is using bulks to send data to elasticsearch. By default the bulk is executed every 100 operations or every 5 seconds. You can change default settings using bulk_size and flush_interval:

{
  "name" : "test",
  "elasticsearch" : {
    "bulk_size" : 1000,
    "flush_interval" : "2s"
  }
}

Note that elasticsearch has a default limit of 100mb per HTTP request. Which means that if you are indexing a massive bulk of documents, you might hit that limit and FSCrawler will throw an error like entity content is too long [xxx] for the configured buffer limit [104857600].

You can either change this limit on elasticsearch side by setting http.max_content_length to a higher value but please be aware that this will consume much more memory on elasticsearch side.

Or you can decrease the bulk_size setting to a smaller value.

Using Ingest Node Pipeline

If you are using an elasticsearch cluster running a 5.0 or superior version, you can use an Ingest Node pipeline to transform documents sent by FS crawler before they are actually indexed. Please note that folder objects are not sent through the pipeline as they are more internal objects.

For example, if you have the following pipeline:

PUT _ingest/pipeline/fscrawler
{
  "description" : "fscrawler pipeline",
  "processors" : [
    {
      "set" : {
        "field": "foo",
        "value": "bar"
      }
    }
  ]
}

In FS crawler settings, set the elasticsearch.pipeline option:

{
  "name" : "test",
  "elasticsearch" : {
    "pipeline" : "fscrawler"
  }
}

Note that this option is available from FS crawler 2.2.

Node settings

FS crawler is using elasticsearch REST layer to send data to your running cluster. By default, it connects to 127.0.0.1 on port 9200 which are the default settings when running a local node on your machine.

Of course, in production, you would probably change this and connect to a production cluster:

{
  "name" : "test",
  "elasticsearch" : {
    "nodes" : [
      { "host" : "mynode1.mycompany.com", "port" : 9200, "scheme" : "HTTP" }
    ]
  }
}

You can define multiple nodes:

{
  "name" : "test",
  "elasticsearch" : {
    "nodes" : [
      { "host" : "mynode1.mycompany.com", "port" : 9200, "scheme" : "HTTP" },
      { "host" : "mynode2.mycompany.com", "port" : 9200, "scheme" : "HTTP" },
      { "host" : "mynode3.mycompany.com", "port" : 9200, "scheme" : "HTTP" }
    ]
  }
}

You can use HTTPS instead of default HTTP (from 2.2):

{
  "name" : "test",
  "elasticsearch" : {
    "nodes" : [
      { "host" : "CLUSTERID.eu-west-1.aws.found.io", "port" : 9243, "scheme" : "HTTPS" }
    ]
  }
}

Using Credentials (X-Pack)

If you secured your elasticsearch cluster with X-Pack, you can provide username and password to FS crawler:

{
  "name" : "test",
  "elasticsearch" : {
    "username" : "elastic",
    "password" : "changeme"
  }
}

WARNING: note that for the current version, the elasticsearch password is stored in plain text in your job setting file.

A better practice is to only set the username or pass it with --username elastic option when starting FS Crawler.

If the password is not defined, you will be prompted when starting the job:

22:46:42,528 INFO  [f.p.e.c.f.FsCrawler] Password for elastic:

Generated fields

FS crawler creates the following fields :

Field Description Example Javadoc
content Extracted content "This is my text!"
attachment BASE64 encoded binary file BASE64 Encoded document
meta.author Author if any in document metadata "David Pilato" CREATOR
meta.title Title if any in document metadata "My document title" TITLE
meta.date Last modified date "2013-04-04T15:21:35" MODIFIED
meta.keywords Keywords if any in document metadata ["river","fs","elasticsearch"] KEYWORDS
meta.language Language (can be detected) "fr" LANGUAGE
meta.format Format of the media "application/pdf; version=1.6" FORMAT
meta.identifier URL/DOI/ISBN for example "FOOBAR" IDENTIFIER
meta.contributor Contributor "foo bar" CONTRIBUTOR
meta.coverage Coverage "FOOBAR" COVERAGE
meta.modifier Last author "David Pilato" MODIFIER
meta.creator_tool Tool used to create the resource "HTML2PDF - TCPDF" CREATOR_TOOL
meta.publisher Publisher: person, organisation, service "elastic" PUBLISHER
meta.relation Related resource "FOOBAR" RELATION
meta.rights Information about rights "CC-BY-ND" RIGHTS
meta.source Source for the current document (derivated) "FOOBAR" SOURCE
meta.type Nature or genre of the content "Image" TYPE
meta.description An account of the content "This is a description" DESCRIPTION
meta.created Date of creation "2013-04-04T15:21:35" CREATED
meta.print_date When was the document last printed? "2013-04-04T15:21:35" PRINT_DATE
meta.metadata_date Last modification of metadata "2013-04-04T15:21:35" METADATA_DATE
meta.latitude The WGS84 Latitude of the Point "N 48° 51' 45.81''" LATITUDE
meta.longitude The WGS84 Longitude of the Point "E 2° 17' 15.331''" LONGITUDE
meta.altitude The WGS84 Altitude of the Point "" ALTITUDE
meta.rating A user-assigned rating -1, [0..5] 0 RATING
meta.comments Comments "Comments" COMMENTS
meta.raw An object with all raw metadata "meta.raw.channels" : "2"
file.content_type Content Type "application/vnd.oasis.opendocument.text"
file.last_modified Last modification date 1386855978000
file.indexing_date Indexing date "2013-12-12T13:50:58.758Z"
file.filesize File size in bytes 1256362
file.indexed_chars Extracted chars if fs.indexed_chars > 0 100000
file.filename Original file name "mydocument.pdf"
file.extension Original file name extension (from 2.2) "pdf"
file.url Original file url "file://tmp/mydir/otherdir/mydocument.pdf"
file.checksum Checksum if fs.checksum set "c32eafae2587bef4b3b32f73743c3c61"
path.virtual Relative path from root path "/mydir/otherdir/mydocument.pdf"
path.root MD5 encoded parent path (for internal use) "112aed83738239dbfe4485f024cd4ce1"
path.real Actual real path name "/tmp/mydir/otherdir/mydocument.pdf"
attributes.owner Owner name "david"
attributes.group Group name "staff"

For more information about meta data, please read the TikaCoreProperties javadoc.

Here is a typical JSON document generated by the crawler:

{
   "file":{
      "filename":"test.odt",
      "extension":"odt",
      "last_modified":1386855978000,
      "indexing_date":"2013-12-12T13:50:58.758Z",
      "content_type":"application/vnd.oasis.opendocument.text",
      "url":"file:///tmp/testfs_metadata/test.odt",
      "indexed_chars":100000,
      "filesize":8355,
      "checksum":"c32eafae2587bef4b3b32f73743c3c61"
   },
   "path":{
      "root":"bceb3913f6d793e915beb70a4735592",
      "virtual":"/test.odt",
      "real":"/tmp/testfs_metadata/test.odt"
   },
   "attributes": {
      "owner": "david",
      "group": "staff"
   },
   "meta":{
      "author":"David Pilato",
      "title":"Mon titre",
      "date":"2013-04-04T15:21:35",
      "keywords":[
         "fs",
         "elasticsearch",
         "crawler"
      ],
      "language":"fr"
   },
   "content":"Bonjour David\n\n\n"
}

Search examples

You can use the content field to perform full-text search on

GET docs/_search
{
  "query" : {
    "match" : {
        "content" : "the quick brown fox"
    }
  }
}

You can use meta fields to perform search on.

GET docs/_search
{
  "query" : {
    "term" : {
        "file.filename" : "mydocument.pdf"
    }
  }
}

Or run some aggregations on top of them, like:

GET docs/_search
{
  "size": 0,
  "aggs": {
    "by_extension": {
      "terms": {
        "field": "file.extension"
      }
    }
  }
}

REST service

From 2.2, FS crawler comes with a REST service available by default at http://127.0.0.1:8080/fscrawler. To activate it, launch FS Crawler with --rest option.

FS Crawler status

To get an overview of the running service, you can call GET / endpoint:

curl http://127.0.0.1:8080/fscrawler/

It will give you a response similar to:

{
  "ok" : true,
  "version" : "2.2",
  "elasticsearch" : "5.1.1",
  "settings" : {
    "name" : "fscrawler-rest-tests",
    "fs" : {
      "url" : "/tmp/es",
      "update_rate" : "15m",
      "json_support" : false,
      "filename_as_id" : false,
      "add_filesize" : true,
      "remove_deleted" : true,
      "store_source" : false,
      "index_content" : true,
      "attributes_support" : false,
      "raw_metadata" : true,
      "xml_support" : false,
      "index_folders" : true,
      "lang_detect" : false
    },
    "elasticsearch" : {
      "nodes" : [ {
        "host" : "127.0.0.1",
        "port" : 9200,
        "scheme" : "HTTP"
      } ],
      "index" : "fscrawler-rest-tests_doc",
      "index_folder" : "fscrawler-rest-tests_folder",
      "bulk_size" : 100,
      "flush_interval" : "5s",
      "username" : "elastic"
    },
    "rest" : {
      "scheme" : "HTTP",
      "host" : "127.0.0.1",
      "port" : 8080,
      "endpoint" : "fscrawler"
    }
  }
}

Uploading a binary document

To upload a binary, you can call POST /_upload endpoint:

echo "This is my text" > test.txt
curl -F "file=@test.txt" "http://127.0.0.1:8080/fscrawler/_upload"

It will give you a response similar to:

{
  "ok" : true,
  "filename" : "test.txt",
  "url" : "http://127.0.0.1:9200/fscrawler-rest-tests_doc/doc/dd18bf3a8ea2a3e53e2661c7fb53534"
}

The url represents the elasticsearch address of the indexed document. If you call:

curl http://127.0.0.1:9200/fscrawler-rest-tests_doc/doc/dd18bf3a8ea2a3e53e2661c7fb53534?pretty

You will get back your document as it has been stored by elasticsearch:

{
  "_index" : "fscrawler-rest-tests_doc",
  "_type" : "doc",
  "_id" : "dd18bf3a8ea2a3e53e2661c7fb53534",
  "_version" : 1,
  "found" : true,
  "_source" : {
    "content" : "This file contains some words.\n",
    "meta" : {
      "raw" : {
        "X-Parsed-By" : "org.apache.tika.parser.DefaultParser",
        "Content-Encoding" : "ISO-8859-1",
        "Content-Type" : "text/plain; charset=ISO-8859-1"
      }
    },
    "file" : {
      "extension" : "txt",
      "content_type" : "text/plain; charset=ISO-8859-1",
      "indexing_date" : "2017-01-04T21:01:08.043",
      "filename" : "test.txt"
    },
    "path" : {
      "virtual" : "test.txt",
      "real" : "test.txt"
    }
  }
}

If you started FS crawler in debug mode with --debug or if you pass debug=true query parameter, then the response will be much more complete:

echo "This is my text" > test.txt
curl -F "file=@test.txt" "http://127.0.0.1:8080/fscrawler/_upload?debug=true"

will give

{
  "ok" : true,
  "filename" : "test.txt",
  "url" : "http://127.0.0.1:9200/fscrawler-rest-tests_doc/doc/dd18bf3a8ea2a3e53e2661c7fb53534",
  "doc" : {
    "content" : "This file contains some words.\n",
    "meta" : {
      "raw" : {
        "X-Parsed-By" : "org.apache.tika.parser.DefaultParser",
        "Content-Encoding" : "ISO-8859-1",
        "Content-Type" : "text/plain; charset=ISO-8859-1"
      }
    },
    "file" : {
      "extension" : "txt",
      "content_type" : "text/plain; charset=ISO-8859-1",
      "indexing_date" : "2017-01-04T14:05:10.325",
      "filename" : "test.txt"
    },
    "path" : {
      "virtual" : "test.txt",
      "real" : "test.txt"
    }
  }
}

Simulate Upload

If you want to get back the extracted content and its metadata but without indexing into elasticsearch you can use simulate=true query parameter:

echo "This is my text" > test.txt
curl -F "file=@test.txt" "http://127.0.0.1:8080/fscrawler/_upload?debug=true&simulate=true"

Document ID

By default, FS crawler encodes the filename to generate an id. Which means that if you send 2 files with the same filename test.txt, the second one will overwrite the first one because they will both share the same ID.

You can force any id you wish by adding id=YOUR_ID in the form data:

echo "This is my text" > test.txt
curl -F "file=@test.txt" -F "id=my-test" "http://127.0.0.1:8080/fscrawler/_upload"

There is a specific id named _auto_ where the ID will be autogenerated by elasticsearch. It means that sending twice the same file will result in 2 different documents indexed.

REST settings

Here is a list of REST service settings (under rest. prefix)`:

Name Default value Documentation
rest.scheme http Scheme. Can be either http or https
rest.host 127.0.0.1 Bound host
rest.port 8080 Bound port
rest.endpoint fscrawler Endpoint

Most local FS settings (under fs in the settings file) also affect the REST service, e.g. fs.indexed_chars. Local FS settings that do not affect the REST service are those such as url, update_rate, includes, excludes. Please check Local FS settings for more details.

REST service is running at http://127.0.0.1:8080/fscrawler by default.

You can change it using rest settings:

{
  "name" : "test",
  "rest" : {
    "scheme" : "HTTP",
    "host" : "192.168.0.1",
    "port" : 8180,
    "endpoint" : "my_fscrawler"
  }
}

It also means that if you are running more than one instance of FS crawler locally, you can (must) change the port.

Tips and tricks

Moving files to a "watched" directory

When moving an existing file to the directory FSCrawler is watching, you need to explicitly touch all the files as when moved, the files are keeping their original date intact:

# single file
touch file_you_moved

# all files
find  -type f  -exec touch {} +

# all .txt files
find  -type f  -name "*.txt" -exec touch {} +

Or you need to restart FSCrawler from the beginning with the --restart option which will reindex everything.

Indexing on HDFS

There is no specific support for HDFS in FS crawler. But you can mount your HDFS on your machine and run FS crawler on this mount point. You can also read details about HDFS NFS Gateway.

OCR integration

To deal with images containing text, just install Tesseract. Tesseract will be auto-detected by Tika or you can explicitly set the path to tesseract binary. Then add an image (png, jpg, ...) into your Fscrawler root directory. After the next index update, the text will be indexed and placed in "_source.content".

By default, FS crawler will try to extract also images from your PDF documents and run OCR on them. This can be a CPU intensive operation. If you don't mean to run OCR on PDF but only on images, you can set fs.pdf_ocr to false:

{
  "name" : "test",
  "fs" : {
    "pdf_ocr" : false
  }
}

OCR settings

Here is a list of OCR settings (under fs.ocr prefix)`:

Name Default value Documentation
fs.ocr.language "eng" OCR Language
fs.ocr.path null OCR Path
fs.ocr.data_path null OCR Data Path

OCR Language

If you have installed a Tesseract Language pack, you can use it when parsing your documents by setting fs.ocr.language property in your ~/.fscrawler/test/_settings.json file:

{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir",
    "ocr" : {
      "language": "eng"
    }
  }
}

OCR Path

If your Tesseract application is not available in default system PATH, you can define the path to use by setting fs.ocr.path property in your ~/.fscrawler/test/_settings.json file:

{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir",
    "ocr" : {
      "path": "/path/to/tesseract/executable"
    }
  }
}

When you set it, it's highly recommended to set the data path for Tesseract.

OCR Data Path

Set the path to the 'tessdata' folder, which contains language files and config files if Tesseract can not be automatically detected. You can define the path to use by setting fs.ocr.data_path property in your ~/.fscrawler/test/_settings.json file:

{
  "name" : "test",
  "fs" : {
    "url" : "/path/to/data/dir",
    "ocr" : {
      "path": "/path/to/tesseract/executable",
      "data_path": "/path/to/tesseract/tessdata"
    }
  }
}

Using docker

To use FS crawler with docker, check docker-fscrawler recipe.

License

This software is licensed under the Apache 2 license, quoted below.

Copyright 2011-2017 David Pilato

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.

Incompatible 3rd party library licenses

Some libraries are not Apache2 compatible. Therefore they are not packaged with FSCrawler so you need to download and add manually them to the lib directory:

See pdfbox for more details.

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Elasticsearch File System Crawler (FS Crawler)

License:Apache License 2.0

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