IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
Elastic Docs ›Elasticsearch-PHP [1.x] ›The Connection Pool
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Changing the Connection Pooledit

Changing the connection pool is very simple: instantiate the client with your chosen connection pool implementation:

$params['connectionPoolClass'] = '\Elasticsearch\ConnectionPool\SniffingConnectionPool';
$client = new Elasticsearch\Client($params);

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« Which connection pool to choose? PHP and connection pooling Selectors »