code: public FessMessages addSuccessBulkProcessStarted(String property) {
          assertPropertyNotNull(property);
          add(property, new UserMessage(SUCCESS_bulk_process_started));
          return this;
      }
docs: Add the created action message for the key 'success.bulk_process_started' with parameters.
  <pre>
  message: Bulk process is started.
  </pre>
  @param property The property name for the message. (NotNull)
  @return this. (NotNull)