/**
* Retrieve a single document.
*
* @param string $id Document identifier
* @param ParamBag $params Search backend parameters
*
* @return RecordCollectionInterface
*/
public function retrieve($id, ParamBag $params = null)
{
$params = $params ?: new ParamBag();
$this->injectResponseWriter($params);
$response = $this->connector->retrieve($id, $params);
$collection = $this->createRecordCollection($response);
$this->injectSourceIdentifier($collection);
return $collection;
}
