Elastica\Client::bulk PHP Method

    public function bulk(array $params)
    {
        if (empty($params)) {
            throw new InvalidException('Array has to consist of at least one param');
        }
        $bulk = new Bulk($this);
        $bulk->addRawData($params);
        return $bulk->send();
    }

 private function flushBulk()
 {
     $this->client->bulk($this->currentBulk);
     $this->currentBulkSize = 0;
     $this->currentBulk = [];
 }