code: def update_object(self, container, obj, metadata, **kwargs):
          
          try:
              LOG.debug('update_object() with %s is success.', self.driver)
              return self.driver.update_object(container, obj,
                                               metadata, **kwargs)
          except DriverException as e:
              LOG.exception('copy_object() with %s raised\
                              an exception %s.', self.driver, e)
docs: Update object metadata
  
          :param container: container name (Container is equivalent to
                            Bucket term in Amazon).
          :param obj: object name (Object is equivalent to
                      Key term in Amazon).
          :param metadata(dict): additional metadata to include in the request.