def __get_postgresql_cluster(self, path: Optional[str] = None) -> Cluster:
        """Low level method to load a :class:`Cluster` object from DCS.

        :param path: optional client path in DCS backend to load from.

        :returns: a loaded :class:`Cluster` instance.
        """
        if path is None:
            path = self.client_path('')
        cluster = self._load_cluster(path, self._postgresql_cluster_loader)
        if TYPE_CHECKING:  # pragma: no cover
            assert isinstance(cluster, Cluster)
        return cluster
Low level method to load a :class:`Cluster` object from DCS.

        :param path: optional client path in DCS backend to load from.

        :returns: a loaded :class:`Cluster` instance.
        
patroni/dcs/__init__.py