*
     * @param searchRequestParams The search request parameters
     * @param data The search render data to populate with results
     * @param userBean Optional user information for permission checking
     */
    public void search(final SearchRequestParams searchRequestParams, final SearchRenderData data,
            final OptionalThing<FessUserBean> userBean) {

     *
     * @return The product version string.
     */
    public String getProductVersion() {
        return productVersion;
    }

    /**
     * Sets the interval for checking the system CPU load.
     *
     * @param systemCpuCheckInterval The interval in milliseconds.
     */
    public void setSystemCpuCheckInterval(final long systemCpuCheckInterval) {