def rollback_vespa(self) -> None:
        """
        Roll back Vespa application package to the previous version backed up in the current app package.
        """
        with self._vespa_deployment_lock():
            vespa_app = self._get_vespa_application(need_binary_file_support=True)
            vespa_app.rollback(version.get_version())

        Roll back Vespa application package to the previous version backed up in the current app package.
        
src/marqo/core/index_management/index_management.py