indexUpdater.setName("IndexUpdater");
        indexUpdater.setPriority(indexUpdaterPriority);
        indexUpdater.setSessionIdList(sessionIdList);
        indexUpdater.setDaemon(true);
        indexUpdater.setCrawlerList(crawlerList);
        getAvailableBoostDocumentRuleList().forEach(rule -> {
            indexUpdater.addDocBoostMatcher(new org.codelibs.fess.indexer.DocBoostMatcher(rule));

            dataCrawlingThread.setPriority(crawlerPriority);
            dataCrawlingThread.setName(sid);
            dataCrawlingThread.setDaemon(true);

            dataCrawlingThreadList.add(dataCrawlingThread);
            dataCrawlingThreadStatusList.add(Constants.READY);

        }

        int startedCrawlerNum = 0;