Class '\Elasticsearch\Endpoints\Bulk' not found

[Samuel Panicucci]

On PHP 5.5.9 and Magento 1.9.3.1 when I try to run

php -f shell/vsf_tools.php -- --action full_reindex --store 1

I gave this error

Full reindexing: store #1 ... 
PHP Fatal error:  Class '\Elasticsearch\Endpoints\Bulk' not found in /home/test/www/lib/vendor/elasticsearch/elasticsearch/src/Elasticsearch/ClientBuilder.php on line 529