Elastica\Query::toArray PHP Method

    public function toArray()
    {
        if (!isset($this->_params['query']) && $this->_suggest == 0) {
            $this->setQuery(new MatchAll());
        }
        if (isset($this->_params['post_filter']) && 0 === count($this->_params['post_filter'])) {
            unset($this->_params['post_filter']);
        }
        $array = $this->_convertArrayable($this->_params);
        if (isset($array['suggest'])) {
            $array['suggest'] = $array['suggest']['suggest'];
        }
        return $array;
    }

 /**
  * 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();
     }
 }