@Override
  public RequestStatus deleteResourcesAuthorized(Request request, Predicate predicate) {
    final Set<Map<String, Object>> propertyMaps = getPropertyMaps(predicate);
    for (Map<String, Object> propertyMap : propertyMaps) {
      if (propertyMap.containsKey(SETTING_NAME_PROPERTY_ID)) {
        dao.removeByName(propertyMap.get(SETTING_NAME_PROPERTY_ID).toString());
      }
    }
    return getRequestStatus(null);
  }
The key property ids for setting resource.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/SettingResourceProvider.java