final FessMessages messages = new FessMessages();
        validationMessagesLambda.message(messages);
        return messageManager.toMessageList(request.getLocale() == null ? Locale.ENGLISH : request.getLocale(), messages)
                .stream()
                .collect(Collectors.joining(" "));
    }

    /**

            // Label type items for filter UI
            final List<Map<String, String>> labelTypeItems = labelTypeHelper.getLabelTypeItemList(SearchRequestType.SEARCH,
                    request.getLocale() == null ? Locale.ROOT : request.getLocale());
            RenderDataUtil.register(data, "labelTypeItems", labelTypeItems);
            RenderDataUtil.register(data, "displayLabelTypeItems", labelTypeItems != null && !labelTypeItems.isEmpty());

    }

    public Long getVersionNo() {
        return asDocMeta().version();
    }

    public void setVersionNo(final Long version) {
        asDocMeta().version(version);
    }

    public Locale getLocale() {
        if (locale == null) {
            if (getValue() == null) {
                return Locale.ROOT;
            }
            locale = ComponentUtil.getFessConfig().getQueryLocaleFromName(getValue());
        }

    @Override
    public Object getAttribute(final String name) {
        return LaRequestUtil.getOptionalRequest().map(req -> req.getAttribute(name)).orElse(null);
    }

    @Override
    public Locale getLocale() {
        return ComponentUtil.getRequestManager().getUserLocale();
    }

    @Override
    public SearchRequestType getType() {
        return SearchRequestType.ADMIN_SEARCH;
    }

    @Override

    @Override
    public Object getAttribute(final String name) {
        return LaRequestUtil.getOptionalRequest().map(req -> req.getAttribute(name)).orElse(null);
    }

    @Override
    public Locale getLocale() {
        return ComponentUtil.getRequestManager().getUserLocale();
    }

    @Override
    public SearchRequestType getType() {
        return SearchRequestType.SEARCH;
    }

    @Override

            return null;
        }

        @Override
        public Object getAttribute(String name) {
            return null;
        }

        @Override
        public Locale getLocale() {
            return null;
        }

        @Override
        public SearchRequestType getType() {
            return null;
        }

        @Override

     * @return The attribute.
     */
    public abstract Object getAttribute(String name);

    /**
     * Returns the locale.
     *
     * @return The locale.
     */
    public abstract Locale getLocale();

    /**
     * Returns the search request type.
     *
     * @return The search request type.
     */
    public abstract SearchRequestType getType();

    /**