runtime.registerData("developmentMode", ComponentUtil.getSearchEngineClient().isEmbedded());
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String installationLink = fessConfig.getOnlineHelpInstallation();
        runtime.registerData("installationLink", getHelpUrl(installationLink));
        runtime.registerData("storageEnabled",

     * comment: Installation guide link for online help.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getOnlineHelpInstallation();

    /**
     * Get the value for the key 'online.help.eol'. <br>
     * The value is, e.g. https://fess.codelibs.org/{lang}/eol.html <br>
     * comment: End-of-life information link for online help.