def create_cluster_snapshot(self, snapshot_identifier, cluster_identifier):
        """
        Creates a snapshot of a cluster

        :param snapshot_identifier: unique identifier for a snapshot of a cluster
        :type snapshot_identifier: str
        :param cluster_identifier: unique identifier of a cluster
        :type cluster_identifier: str
        """
        response = self.get_conn().create_cluster_snapshot(
            SnapshotIdentifier=snapshot_identifier,
            ClusterIdentifier=cluster_identifier,
        )
        return response['Snapshot'] if response['Snapshot'] else None
Creates a snapshot of a cluster

        :param snapshot_identifier: unique identifier for a snapshot of a cluster
        :type snapshot_identifier: str
        :param cluster_identifier: unique identifier of a cluster
        :type cluster_identifier: str