*/
    public FacetResponse getCachedFacetResponse(final String query) {
        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);