docs: private Set<String> addEntityAttributes(
          CmsObject cms,
          CmsXmlContent content,
          String parentPath,
          CmsEntity entity,
          Locale contentLocale) {
  
          Set<String> fieldsSet = Sets.newHashSet();
          addEntityAttributes(cms, content, parentPath, entity, contentLocale, fieldsSet);
          return fieldsSet;
      }