final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        ComponentUtil.getFessConfig();
        final ProtocolHelper protocolHelper = ComponentUtil.getProtocolHelper();

        final long startTime = systemHelper.getCurrentTimeAsLong();

        final List<String> sessionIdList = new ArrayList<>();
        crawlerList.clear();

    private static final String CORS_HANDLER_FACTORY = "corsHandlerFactory";

    private static final String RANK_FUSION_PROCESSOR = "rankFusionProcessor";

    private static final String PROTOCOL_HELPER = "protocolHelper";

    private static IndexingHelper indexingHelper;

    private static CrawlingConfigHelper crawlingConfigHelper;

    private static SystemHelper systemHelper;