/**
* Advances scan page.
*
* @return $this
*/
protected function page()
{
if ($this->key() == $this->count() || !$this->isScrollable()) {
return $this;
}
$raw = $this->manager->scroll($this->scrollId, $this->scrollDuration, Result::RESULTS_RAW);
$this->rewind();
$this->scrollId = $raw['_scroll_id'];
$this->documents = $raw['hits']['hits'];
return $this;
}