docs: public void setIncludeIndex(final Boolean includeIndex) {
          if (includeIndex == null && this.includeIndex == null) {
              return;
          } else if (includeIndex == null) {
              removeChild(this.includeIndex);
              this.includeIndex = null;
          } else if (this.includeIndex == null) {
              this.includeIndex = new KeyValueNode<Boolean>(CommonConstants.CS_INDEX_TITLE, includeIndex);
              appendChild(this.includeIndex, false);
          } else {
              this.includeIndex.setValue(includeIndex);
          }
      }