code: def get_by_metadata(self, metadata_search_criteria: Union[SearchCriterion, Iterable[SearchCriterion]],
                          load_metadata: bool=True, zone: str=None) -> Sequence[EntityType]:
          
docs: Gets entities from iRODS that have metadata that matches the given search criteria.
          :param metadata_search_criteria: the metadata search criteria
          :param load_metadata: whether metadata associated to the entities should be loaded
          :param zone: limit query to specific zone in iRODS
          :return: the matched entities in iRODS