*   `Estimator.export_savedmodel` has been renamed to `export_saved_model`.
    *   When saving to SavedModel, Estimators will strip default op attributes.
        This is almost always the correct behavior, as it is more forwards
        compatible, but if you require that default attributes to be saved with
        the model, please use `tf.compat.v1.Estimator`.
    *   Feature Columns have been upgraded to be more Eager-friendly and to work

                      - required:
                        - cluster
                      properties:
                        cluster:
                          description: Match on envoy cluster attributes.
                          properties:
                            name:
                              description: The exact name of the cluster to match.
                              type: string