Acknowledges the successful processing of one or more messages.
        name: name of the stream.
        groupname: name of the consumer group.
        *ids: message ids to acknowlege.

def xack(self, name, groupname, *ids):
        """
        Acknowledges the successful processing of one or more messages.
        name: name of the stream.
        groupname: name of the consumer group.
        *ids: message ids to acknowlege.
        """
        return self.execute_command('XACK', name, groupname, *ids)