Elastica\Client::request PHP Method

    public function request($path, $method = Request::GET, $data = [], array $query = [])
    {
        $connection = $this->getConnection();
        $request = $this->_lastRequest = new Request($path, $method, $data, $query, $connection);
        $this->_lastResponse = null;
        try {
            $response = $this->_lastResponse = $request->send();
        } catch (ConnectionException $e) {
            $this->_connectionPool->onFail($connection, $e, $this);
            $this->_log($e);
            // In case there is no valid connection left, throw exception which caused the disabling of the connection.
            if (!$this->hasConnection()) {
                throw $e;
            }
            return $this->request($path, $method, $data, $query);
        }
        $this->_log($request);
        return $response;
    }

 /**
  * Iterate on index documents and perform $closure
  * Iteration uses ElasticSearch scroll scan methods
  * Note: Using setLimit(N) and setFrom(N) for query does not affect actual limit and offset (Limited by ES scan/scroll functionality, see Docs in link)
  *
  * See docs about $scroll in link:
  * @link http://www.elasticsearch.org/guide/reference/api/search/scroll.html
  *
  * @param Query|AbstractQuery $query
  * @param \Closure $closure Receives arguments: function(DataProviderDocument $doc, $i, $total); Return TRUE in $closure if you want to break and stop iteration
  * @param int $batchSize
  * @param string $scroll
  */
 public function iterate(Query $query, \Closure $closure, $batchSize = 100, $scroll = '5m')
 {
     $response = $this->index->request('_search', 'GET', $query->toArray(), array('search_type' => 'scan', 'scroll' => $scroll, 'size' => $batchSize, 'limit' => 1));
     $data = $response->getData();
     $scrollId = $data['_scroll_id'];
     $total = $data['hits']['total'];
     $i = 0;
     $response = $this->client->request('_search/scroll', 'GET', $scrollId, array('scroll' => $scroll));
     $data = $response->getData();
     while (count($data['hits']['hits']) > 0) {
         foreach ($data['hits']['hits'] as $item) {
             $itemData = $item['_source'];
             $doc = new DataProviderDocument($item['_id'], $item['_type'], $itemData);
             if ($break = $closure($doc, $i, $total)) {
                 break 2;
             }
             $i++;
         }
         $scrollId = $data['_scroll_id'];
         $response = $this->client->request('_search/scroll', 'GET', $scrollId, array('scroll' => $scroll));
         $data = $response->getData();
     }
 }