$_connection
$_connection : \Elastica\Connection
Elastica Null Transport object.
This is used in case you just need a test transport that doesn't do any connection to an elasticsearch host but still returns a valid response object
$_connection : \Elastica\Connection
__construct(\Elastica\Connection  $connection = null) 
                Construct transport.
| \Elastica\Connection | $connection | Connection object | 
getConnection() : \Elastica\Connection
Connection object
setConnection(\Elastica\Connection  $connection) : $this
                
| \Elastica\Connection | $connection | Connection object | 
exec(\Elastica\Request $request, array $params) : \Elastica\Response
Null transport.
| \Elastica\Request | $request | Request object | 
| array | $params | Hostname, port, path, ... | 
Response empty object
create(mixed $transport, \Elastica\Connection $connection, array $params = array()) : \Elastica\Transport\AbstractTransport
Create a transport.
The $transport parameter can be one of the following values:
| mixed | $transport | A transport definition | 
| \Elastica\Connection | $connection | A connection instance | 
| array | $params | Parameters for the transport class |