$_params
$_params : array
Params.
Returns child documents having parent docs matching the query.
This function can be used to handle params for queries, filter
__construct(string|\Elastica\Query|\Elastica\Query\AbstractQuery $query, string $type)
Construct HasChild Query.
| string|\Elastica\Query|\Elastica\Query\AbstractQuery | $query | |
| string | $type | Parent document type | 
setQuery(string|\Elastica\Query|\Elastica\Query\AbstractQuery  $query) : $this
                Sets query object.
| string|\Elastica\Query|\Elastica\Query\AbstractQuery | $query |