final TimeValue interval = TimeValue.parseTimeValue(fessConfig.getCrawlerHotthreadInterval(), "crawler.hotthread.interval");
        final int threads = fessConfig.getCrawlerHotthreadThreadsAsInteger();
        final String timeout = fessConfig.getCrawlerHotthreadTimeout();
        final String type = fessConfig.getCrawlerHotthreadType();
        try {

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getCrawlerHotthreadThreadsAsInteger();

    /**
     * Get the value for the key 'crawler.hotthread.timeout'. <br>
     * The value is, e.g. 30s <br>
     * comment: Timeout for hot thread monitoring (e.g., 30s).