code: def get_datafeeds(self, datafeed_id=None, params=None):
          
          return self.transport.perform_request(
              "GET", _make_path("_ml", "datafeeds", datafeed_id), params=params
          )
docs: `<http://www.elastic.co/guide/en/elasticsearch/reference/current/ml-get-datafeed.html>`_
  
          :arg datafeed_id: The ID of the datafeeds to fetch
          :arg allow_no_datafeeds: Whether to ignore if a wildcard expression
              matches no datafeeds. (This includes `_all` string or when no
              datafeeds have been specified)