/** The key of the configuration. e.g. ja */
    String ONLINE_HELP_SUPPORTED_LANGS = "online.help.supported.langs";

    /** The key of the configuration. e.g. https://discuss.codelibs.org/c/Fess{lang}/ */
    String FORUM_LINK = "forum.link";

    /** The key of the configuration. e.g. en,ja */
    String FORUM_SUPPORTED_LANGS = "forum.supported.langs";

    /** The key of the configuration. e.g. 0 */

            String[] langs = (String[]) propMap.get(QUERY_DEFAULT_LANGUAGES);
            if (langs == null) {
                langs = split(getQueryDefaultLanguages(), ",").get(stream -> stream.map(String::trim).toArray(n -> new String[n]));
                propMap.put(QUERY_DEFAULT_LANGUAGES, langs);

            }
            return normalizeQueryLanguages(langs);
        }

        final StringBuilder buf = new StringBuilder(255);
        try {
            final RequestParameter parameter = RequestParameter.parse(request);
            final String[] langs = searchHelper.getLanguages(request, parameter);

            final SuggestHelper suggestHelper = ComponentUtil.getSuggestHelper();
            final SuggestRequestBuilder builder = suggestHelper.suggester().suggest();

        }
        final float importantContantLangBoost = fessConfig.getQueryBoostImportantContentLangAsDecimal().floatValue();
        getQueryLanguages().ifPresent(langs -> stream(langs).of(stream -> stream.forEach(lang -> {
            boolQuery.should(
                    builder.apply(fessConfig.getIndexFieldTitle() + "_" + lang, fessConfig.getQueryBoostTitleLangAsDecimal().floatValue()));

            if (virtualHost != null) {
                tags.add(virtualHost);
            }

            if (sb.length() > 0) {
                final String[] langs = searchLog.getLanguages() == null ? new String[] {} : searchLog.getLanguages().split(",");
                stream(searchLog.getRoles()).of(stream -> stream.forEach(role -> roles.add(role)));