tsushant / laravel-elasticsearch

Elasticsearch with Laravel

About Laravel

Laravel is a web application framework with expressive, elegant syntax. We believe development must be an enjoyable and creative experience to be truly fulfilling. Laravel attempts to take the pain out of development by easing common tasks used in the majority of web projects, such as:

Elasticsearch

Index a document

In elasticsearch-php, almost everything is configured by associative arrays. The REST endpoint, document and optional parameters - everything is an associative array.

To index a document, we need to specify four pieces of information: index, type, id and a document body. This is done by constructing an associative array of key:value pairs. The request body is itself an associative array with key:value pairs corresponding to the data in your document:

$params = [
    'index' => 'my_index',
    'type' => 'my_type',
    'id' => 'my_id',
    'body' => ['testField' => 'abc']
];

$response = $client->index($params);
print_r($response);

The response that you get back indicates the document was created in the index that you specified. The response is an associative array containing a decoded version of the JSON that Elasticsearch returns:

Array
(
    [_index] => my_index
    [_type] => my_type
    [_id] => my_id
    [_version] => 1
    [created] => 1
)

Get a document

Let's get the document that we just indexed. This will simply return the document:

$params = [
    'index' => 'my_index',
    'type' => 'my_type',
    'id' => 'my_id'
];

$response = $client->get($params);
print_r($response);

The response contains some metadata (index, type, etc.) as well as a _source field...this is the original document that you sent to Elasticsearch.

Array
(
    [_index] => my_index
    [_type] => my_type
    [_id] => my_id
    [_version] => 1
    [found] => 1
    [_source] => Array
        (
            [testField] => abc
        )

)

If you want to retrieve the _source field directly, there is the getSource method:

$params = [
    'index' => 'my_index',
    'type' => 'my_type',
    'id' => 'my_id'
];

$source = $client->getSource($params);
doSomething($source);

Search for a document

Searching is a hallmark of Elasticsearch, so let's perform a search. We are going to use the Match query as a demonstration:

$params = [
    'index' => 'my_index',
    'type' => 'my_type',
    'body' => [
        'query' => [
            'match' => [
                'testField' => 'abc'
            ]
        ]
    ]
];

$response = $client->search($params);
print_r($response);

The response is a little different from the previous responses. We see some metadata (took, timed_out, etc.) and an array named hits. This represents your search results. Inside of hits is another array named hits, which contains individual search results:

Array
(
    [took] => 1
    [timed_out] =>
    [_shards] => Array
        (
            [total] => 5
            [successful] => 5
            [failed] => 0
        )

    [hits] => Array
        (
            [total] => 1
            [max_score] => 0.30685282
            [hits] => Array
                (
                    [0] => Array
                        (
                            [_index] => my_index
                            [_type] => my_type
                            [_id] => my_id
                            [_score] => 0.30685282
                            [_source] => Array
                                (
                                    [testField] => abc
                                )
                        )
                )
        )
)

Delete a document

Alright, let's go ahead and delete the document that we added previously:

$params = [
    'index' => 'my_index',
    'type' => 'my_type',
    'id' => 'my_id'
];

$response = $client->delete($params);
print_r($response);

You'll notice this is identical syntax to the get syntax. The only difference is the operation: delete instead of get. The response will confirm the document was deleted:

Array
(
    [found] => 1
    [_index] => my_index
    [_type] => my_type
    [_id] => my_id
    [_version] => 2
)

Delete an index

Due to the dynamic nature of Elasticsearch, the first document we added automatically built an index with some default settings. Let's delete that index because we want to specify our own settings later:

$deleteParams = [
    'index' => 'my_index'
];
$response = $client->indices()->delete($deleteParams);
print_r($response);

The response:

Array
(
    [acknowledged] => 1
)

Create an index

Now that we are starting fresh (no data or index), let's add a new index with some custom settings:

$params = [
    'index' => 'my_index',
    'body' => [
        'settings' => [
            'number_of_shards' => 2,
            'number_of_replicas' => 0
        ]
    ]
];

$response = $client->indices()->create($params);
print_r($response);

Elasticsearch will now create that index with your chosen settings, and return an acknowledgement:

Array
(
    [acknowledged] => 1
)