/**
  * get document list
  * 문서 리스트 조회
  *
  * @param array        $wheres  make where query
  * @param array        $orders  make order query
  * @param ConfigEntity $config  config entity
  * @param int          $limit   limit
  * @param array        $columns get columns
  * @return array
  */
 public function fetch(array $wheres = null, array $orders = null, ConfigEntity $config = null, $limit = null, array $columns = ['*'])
 {
     return $this->document->fetch($wheres, $orders, $config, $limit, $columns);
 }