docs: def save_metadata(self, file_path):
      """Saves a json file of the search result metadata.
      
      Saves a json file of the search result metadata from :class:`api.results`.metadata.
      
      Args:
        file_path (str):
          Path to the json file to save metadata to.
      """
      data = self.metadata
      with open(file_path, 'w')  as out_file:
        json.dump(data, out_file)