d of file to rename
          file_id = fs.upload_from_stream("test_file", "data I want to store!")
          fs.rename(file_id, "new_test_name")

        Raises :exc:`~gridfs.errors.NoFile` if no file with file_id exists.

        :Parameters:
          - `file_id`: The _id of the file to be renamed.
          - `new_filename`: The new name of the file.
          - `session` (optional): a
            :class:`~pymongo.client_session.ClientSession`

        .. versionchanged:: 3.6
           Added ``session`` parameter.
        r8