final CrawlingInfoHelper crawlingInfoHelper = ComponentUtil.getCrawlingInfoHelper();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        final Date documentExpires = crawlingInfoHelper.getDocumentExpires(config);
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final Map<String, String> paramEnvMap = systemHelper.getFilteredEnvMap(fessConfig.getCrawlerDataEnvParamKeyPattern());