Map<String, Object> propMap = new ConcurrentHashMap<>();

    String getOrDefault(String propertyKey, String defaultValue);

    //
    // system.properties
    //

    default void storeSystemProperties() {
        ComponentUtil.getSystemProperties().store();
    }

    default String getSystemProperty(final String key) {

        fessConfig.setSystemProperty("entraid.use.ds", String.valueOf(isCheckboxEnabled(form.entraidUseDs)));

        fessConfig.storeSystemProperties();
        ComponentUtil.getLdapManager().updateConfig();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        systemHelper.refreshDesignJspFiles();