}

    public CrawlJob hotThread(final int hotThreadInterval) {
        this.hotThreadInterval = hotThreadInterval;
        return this;
    }

    @Override
    public String execute() {
        //   check # of crawler processes
        final int maxCrawlerProcesses = ComponentUtil.getFessConfig().getJobMaxCrawlerProcessesAsInteger();
        if (maxCrawlerProcesses > 0) {
            final int runningJobCount = getRunningJobCount();