@Override
        public String toString() {
            return "Group{" +
                   "docIdPart='" + docIdPart + '\'' +
                   ", selection='" + selection + '\'' +
                   '}';
        }
Returns the last property with the given name, if present, or throws if this is empty or blank.
vespaclient-container-plugin/src/main/java/com/yahoo/document/restapi/resource/DocumentV1ApiHandler.java