}

    default int getDayForCleanup() {
        return getSystemPropertyAsInt(Constants.DAY_FOR_CLEANUP_PROPERTY, Constants.DEFAULT_DAY_FOR_CLEANUP);
    }

    default void setCrawlingThreadCount(final int value) {
        setSystemPropertyAsInt(Constants.CRAWLING_THREAD_COUNT_PROPERTY, value);
    }

    default int getCrawlingThreadCount() {

        fessConfig.setIncrementalCrawling(isCheckboxEnabled(form.incrementalCrawling));
        fessConfig.setDayForCleanup(form.dayForCleanup);
        fessConfig.setCrawlingThreadCount(form.crawlingThreadCount);
        fessConfig.setUserAgentName(form.crawlingUserAgent);
        fessConfig.setSearchLog(isCheckboxEnabled(form.searchLog));
        fessConfig.setUserInfo(isCheckboxEnabled(form.userInfo));