final int threads = fessConfig.getCrawlerHotthreadThreadsAsInteger();
        final String timeout = fessConfig.getCrawlerHotthreadTimeout();
        final String type = fessConfig.getCrawlerHotthreadType();
        try {
            final SearchEngineClient esClient = ComponentUtil.getSearchEngineClient();
            final NodesHotThreadsResponse response = esClient.admin()
                    .cluster()

     * The value is, e.g. cpu <br>
     * comment: Type of hot thread monitoring (e.g., cpu).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerHotthreadType();

    /**
     * Get the value for the key 'crawler.metadata.content.excludes'. <br>
     * The value is, e.g. resourceName,X-Parsed-By,Content-Encoding.*,Content-Type.*,X-TIKA.*,X-FESS.* <br>