* @param form The search form.
     */
    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "boostDocumentRuleItems", boostDocumentRuleService.getBoostDocumentRuleList(boostDocPager)); // page navi

        // restore from pager
        copyBeanToBean(boostDocPager, form, op -> op.include("urlExpr", "boostExpr"));
    }