$_params
$_params : array
Params.
Ids Filter.
This function can be used to handle params for queries, filter
__construct(string|\Elastica\Type $type = null, array $ids = array())
Creates filter object.
| string|\Elastica\Type | $type | Type to filter on | 
| array | $ids | List of ids | 
addType(string|\Elastica\Type  $type) : $this
                Adds one more type to query.
| string|\Elastica\Type | $type | Type name or object | 
setType(string|\Elastica\Type  $type) : $this
                Set type.
| string|\Elastica\Type | $type | Type name or object |