/** The key of the configuration. e.g. location */
    String QUERY_GEO_FIELDS = "query.geo.fields";

    /** The key of the configuration. e.g. browser_lang */
    String QUERY_BROWSER_LANG_PARAMETER_NAME = "query.browser.lang.parameter.name";

    /** The key of the configuration. e.g. true */
    String QUERY_REPLACE_TERM_WITH_PREFIX_QUERY = "query.replace.term.with.prefix.query";

    public static final String GOOGLE_CHAT_WEBHOOK_URLS_PROPERTY = "google.chat.webhook.urls";

    public static final String USE_BROWSER_LOCALE_FOR_SEARCH_PROPERTY = "search.use.browser.locale";

    public static final String SUGGEST_SEARCH_LOG_PROPERTY = "suggest.searchlog";

    public static final String SUGGEST_DOCUMENTS_PROPERTY = "suggest.document";

        }
        return OptionalObject.empty();
    }

    @Override
    public OptionalThing<Locale> getRequestedLocale(final RequestManager requestManager) {
        return OptionalObject.empty(); // means browser default
    }

    // ===================================================================================
    //                                                                      Basic Override

        return getSystemPropertyAsBoolean(Constants.SEARCH_FILE_PROXY_PROPERTY, true);
    }

    default boolean isBrowserLocaleForSearchUsed() {
        return getSystemPropertyAsBoolean(Constants.USE_BROWSER_LOCALE_FOR_SEARCH_PROPERTY, false);
    }

    default String[] getDefaultSortValues(final OptionalThing<FessUserBean> userBean) {
        @SuppressWarnings("unchecked")