code: @Override
      public Map<String, Object> toSource() {
          Map<String, Object> sourceMap = new HashMap<>();
          if (elevateWordId != null) {
              addFieldToSource(sourceMap, "elevateWordId", elevateWordId);
          }
          if (labelTypeId != null) {
              addFieldToSource(sourceMap, "labelTypeId", labelTypeId);
          }
          return sourceMap;
      }
docs: ======