code: def preview_datafeed(self, datafeed_id, params=None):
          
          if datafeed_id in SKIP_IN_PATH:
              raise ValueError(
                  "Empty value passed for a required argument 'datafeed_id'."
              )
          return self.transport.perform_request(
              "GET",
              _make_path("_ml", "datafeeds", datafeed_id, "_preview"),
              params=params,
          )
docs: `<http://www.elastic.co/guide/en/elasticsearch/reference/current/ml-preview-datafeed.html>`_
  
          :arg datafeed_id: The ID of the datafeed to preview