docs: public static CmsSearchFieldMappingType valueOf(String value) {
  
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(value)) {
              return null;
          }
          value = value.trim().toLowerCase();
          if (STR_CONTENT.equals(value)) {
              return CONTENT;
          } else if (STR_PROPERTY.equals(value)) {
              return PROPERTY;
          } else if (STR_PROPERTY_SEARCH.equals(value)) {
              return PROPERTY_SEARCH;
          } else if (STR_ITEM.equals(value)) {
              return ITEM;
          } else if (STR_DYNAMIC.equals(value)) {
              return DYNAMIC;
          } else if (STR_ATTRIBUTE.equals(value)) {
              return ATTRIBUTE;
          }
          return null;
      }