https://docs.cloud.google.com/appengine/docs/standard/python3/reference/services/bundled/google/appengine/api/search/search_util/UnsupportedOnDevError
google.appengine.api.search.search_util.UnsupportedOnDevError | App Engine standard environment |...
Indicates attempt to perform an action unsupported on the dev server.
api searchapp enginegoogleappengineutil