final int windowSize = fessConfig.getRankFusionWindowSizeAsInteger();
        if (maxPageSize * 2 < windowSize) {
            logger.warn("rank.fusion.window_size is lower than paging.search.page.max.size. "
                    + "The window size should be 2x more than the page size. ({} * 2 <= {})", maxPageSize, windowSize);
            this.windowSize = 2 * maxPageSize;
        } else {

    }

    protected Map<String, Object> toLowerHyphen(final Map<String, Object> source) {
        return source.entrySet().stream()
                .collect(Collectors.toMap(e -> CaseFormat.UPPER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, e.getKey()), e -> {
                    final Object value = e.getValue();
                    if (value instanceof Map) {
                        @SuppressWarnings("unchecked")

        if (list.isEmpty()) {
            return null;
        }
        if (list.size() >= 2) {
            String msg = "The size of selected list is over 1: " + list.size();
            throw new FetchingOverSafetySizeException(msg, 1); // immediately caught by caller and translated
        }
        return list.get(0);
    }

    @Override

labels.search=Search
labels.similar_doc_result_status=Similar results are displayed.
labels.search_result_status=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of <b>{1}</b> for <b>{0}</b>
labels.search_result_status_over=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of about <b>{1}</b> for <b>{0}</b>
labels.search_result_time=({0} sec)
labels.prev_page=Prev
labels.next_page=Next

labels.search=Search
labels.similar_doc_result_status=Similar results are displayed.
labels.search_result_status=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of <b>{1}</b> for <b>{0}</b>
labels.search_result_status_over=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of about <b>{1}</b> for <b>{0}</b>
labels.search_result_time=({0} sec)
labels.prev_page=Prev
labels.next_page=Next

labels.menu_related_content=Related Content
labels.menu_related_query=Related Query
labels.menu_plugin=Plugin
labels.menu_storage=Storage
labels.similar_doc_result_status=Similar results are displayed.
labels.search_result_status_over=Results <b>{2}</b><span class="hidden-phone"> -</span> <b>{3}</b> of about <b>{1}</b> for <b>{0}</b>
labels.search_related_queries=Related Words:
labels.search_result_similar=Similar Results ({0})