$_params
$_params : array
Params.
More Like This query.
This function can be used to handle params for queries, filter
setFields(array  $fields) : \Elastica\Query\MoreLikeThis
                Set fields to which to restrict the mlt query.
| array | $fields | Field names  | 
                            
Current object
setLike(string|\Elastica\Document  $like) : $this
                Set the "like" value.
| string|\Elastica\Document | $like |