docs: def multipart_complete(self, multipart):
          """Complete a multipart upload.
  
          :param multipart: A :class:`invenio_files_rest.models.MultipartObject`
              instance.
          :returns: A Flask response.
          """
          multipart.complete()
          db.session.commit()
  
          version_id = str(uuid.uuid4())
  
          return self.make_response(
              data=multipart,
              context={
                  'class': MultipartObject,
                  'bucket': multipart.bucket,
                  'object_version_id': version_id,
              },
              # This will wait for the result, and send whitespace on the
              # connection until the task has finished (or max timeout reached).
              task_result=merge_multipartobject.delay(
                  str(multipart.upload_id),
                  version_id=version_id,
              ),
          )