def subscribe_async(self, subject, **kwargs):
        """
        Sets the subcription to use a task per message to be processed.

        ..deprecated:: 7.0
          Will be removed 9.0.
        """
        kwargs["is_async"] = True
        sid = yield from self.subscribe(subject, **kwargs)
        return sid
Sets the subcription to use a task per message to be processed.

        ..deprecated:: 7.0
          Will be removed 9.0.