val agentNum: Int
        get() {
            if (System.getenv().containsKey("USERNAME")) {
                val agentNumEnv = System.getenv("USERNAME").replaceFirst("tcagent", "")
                if (Regex("""\d+""").containsMatchIn(agentNumEnv)) {
                    return agentNumEnv.toInt()
                }
            }
            return 1
        }

        if (locale != null) {
            final String lang = locale.getLanguage();
            if (ComponentUtil.getFessConfig().isOnlineHelpSupportedLang(lang)) {
                return url.replaceFirst("\\{lang\\}", lang).replaceFirst("\\{version\\}", majorVersion + "." + minorVersion);
            }
        }
        return getDefaultHelpLink(url);
    }

    /**
     * Gets the default help link for a given URL.

                        indexName = configIndex.replaceFirst(Pattern.quote(CONFIG_INDEX_PREFIX), name);
                    } else if (configIndex.startsWith(USER_INDEX_PREFIX)) {
                        final String name = fessConfig.getIndexUserIndex();
                        indexName = configIndex.replaceFirst(Pattern.quote(USER_INDEX_PREFIX), name);

        if ("/_plugin".equals(path) || path.startsWith("/_plugin/")) {
            processPluginRequest(request, response, path.replaceFirst("^/_plugin", StringUtil.EMPTY));
            return;
        }

        final Method httpMethod = Method.valueOf(request.getMethod().toUpperCase(Locale.ROOT));

     *
     * @return the coordinator index name.
     */
    protected String getIndexName() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return INDEX_NAME.replaceFirst("fess_config", fessConfig.getIndexConfigIndex());
    }

    // ===================================================================================