code: def sink_update(
          self, project, sink_name, filter_, destination, unique_writer_identity=False
      ):
          
          target = "/projects/%s/sinks/%s" % (project, sink_name)
          data = {"name": sink_name, "filter": filter_, "destination": destination}
          query_params = {"uniqueWriterIdentity": unique_writer_identity}
          return self.api_request(
              method="PUT", path=target, query_params=query_params, data=data
          )
docs: API call:  update a sink resource.
  
          See
          https://cloud.google.com/logging/docs/reference/v2/rest/v2/projects.sinks/update
  
          :type project: str
          :param project: ID of the project containing the sink.
  
          :type sink_name: str
          :param sink_name: the name of the sink
  
          :type filter_: str
          :param filter_: the advanced logs filter expression defining the
                          entries exported by the sink.
  
          :type destination: str
          :param destination: destination URI for the entries exported by
                              the sink.
  
          :type unique_writer_identity: bool
          :param unique_writer_identity: (Optional) determines the kind of
                                         IAM identity returned as
                                         writer_identity in the new sink.
  
          :rtype: dict
          :returns: The returned (updated) resource.