* <pre>
     * message: Started a bulk process.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addSuccessBulkProcessStarted(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(SUCCESS_bulk_process_started));
        return this;
    }

    /**