public function deleteFromIndex()
    {
        $all = $this->all();

        $params = array();

        foreach ($all as $item) {
            $params['body'][] = array(
                'delete' => array(
                    '_id' => $item->getKey(),
                    '_type' => $item->getTypeName(),
                    '_index' => $item->getIndexName(),
                ),
            );
        }

        return $this->getElasticSearchClient()->bulk($params);
    }