final OptionalThing<FessUserBean> userBean = ComponentUtil.getComponent(FessLoginAssist.class).getSavedUserBean();
        final String permissionKey = userBean.map(user -> StreamUtil.stream(user.getPermissions())
                .get(stream -> stream.sorted().distinct().collect(Collectors.joining("\n")))).orElse(StringUtil.EMPTY);

        try {
            return facetCache.get(query + "\n" + permissionKey, () -> {

        if (fessConfig.isLdapAllowEmptyPermission()) {
            return true;
        }

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        for (final String permission : ldapUser.getPermissions()) {
            if (!systemHelper.isUserPermission(permission)) {
                return true;
            }
        }
        return false;
    }