public function indexStats() : Stage\IndexStats
    {
        $stage = new Stage\IndexStats($this);
        $this->addStage($stage);

        return $stage;
    }
public function indexStats() : Stage\IndexStats
    {
        $stage = new Stage\IndexStats($this);
        $this->addStage($stage);

        return $stage;
    }
public function indexStats ( ) : Stage \ IndexStats { $ stage = new Stage \ IndexStats ( $ this ) ; $ this -> addStage ( $ stage ) ; return $ stage ; }
Returns statistics regarding the use of each index for the collection.

@see https://docs.mongodb.org/manual/reference/operator/aggregation/indexStats/
Returns statistics regarding the use of each index for the collection .