}

    /**
     * Sets the list of crawler instances that this updater will manage.
     *
     * @param crawlerList the list of crawlers to set
     */
    public void setCrawlerList(final List<Crawler> crawlerList) {
        this.crawlerList = crawlerList;
    }

        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));
        });
        indexUpdater.start();