code: def sink(self, name, filter_=None, destination=None):
          
          return Sink(name, filter_, destination, client=self)
docs: Creates a sink bound to the current client.
  
          :type name: str
          :param name: the name of the sink to be constructed.
  
          :type filter_: str
          :param filter_: (optional) the advanced logs filter expression
                          defining the entries exported by the sink.  If not
                          passed, the instance should already exist, to be
                          refreshed via :meth:`Sink.reload`.
  
          :type destination: str
          :param destination: destination URI for the entries exported by
                              the sink.  If not passed, the instance should
                              already exist, to be refreshed via
                              :meth:`Sink.reload`.
  
          :rtype: :class:`google.cloud.logging.sink.Sink`
          :returns: Sink created with the current client.