code: public FessMessages addSuccessStartedDataUpdate(String property) {
          assertPropertyNotNull(property);
          add(property, new UserMessage(SUCCESS_started_data_update));
          return this;
      }
docs: Add the created action message for the key 'success.started_data_update' with parameters.
  <pre>
  message: Started data update process.
  </pre>
  @param property The property name for the message. (NotNull)
  @return this. (NotNull)