docs: public static String getGrouperGroupAttribute(final GrouperGroupField groupField, final WsGroup group) {
          switch (groupField) {
              case DISPLAY_EXTENSION:
                  return group.getDisplayExtension();
              case DISPLAY_NAME:
                  return group.getDisplayName();
              case EXTENSION:
                  return group.getExtension();
              case NAME:
              default:
                  return group.getName();
          }
      }