docs: def set_consistent(self, consistent_config):
          """ Indicates that the stream is the start of a consistent region.
  
          Args:
              consistent_config(consistent.ConsistentRegionConfig): the configuration of the consistent region.
  
          Returns:
              Stream: Returns this stream.
  
          .. versionadded:: 1.11
          """
  
          # add job control plane if needed
          self.topology._add_job_control_plane()
          self.oport.operator.consistent(consistent_config)
          return self._make_placeable()