try {
            final List<Map<String, String>> labelTypeItems = labelTypeHelper.getLabelTypeItemList(SearchRequestType.JSON,
                    request.getLocale() == null ? Locale.ROOT : request.getLocale());
            buf.append("\"record_count\":");
            buf.append(labelTypeItems.size());
            if (!labelTypeItems.isEmpty()) {
                buf.append(',');

        if (labels != null && labels.length > 0) {
            // Validate against configured label types (union of request locale and ROOT for robustness)
            final Locale requestLocale = request.getLocale() != null ? request.getLocale() : Locale.ROOT;
            final Set<String> allowedLabels = new java.util.HashSet<>();
            ComponentUtil.getLabelTypeHelper()

        }

        @Override
        public String getSimilarDocHash() {
            return null;
        }

        @Override
        public java.util.Locale getLocale() {
            return java.util.Locale.ROOT;
        }
    }

    // Mock classes
    private static class MockFessConfig extends FessConfig.SimpleImpl {

            validationMessagesLambda.message(messages);
            message = ComponentUtil.getMessageManager()
                    .toMessageList(LaRequestUtil.getOptionalRequest().map(HttpServletRequest::getLocale).orElse(Locale.ENGLISH), messages)
                    .stream()
                    .collect(Collectors.joining(" "));
            return this;
        }
    }

    /**