form.thumbnail = fessConfig.isThumbnailEnabled() ? Constants.TRUE : Constants.FALSE;
        form.incrementalCrawling = fessConfig.isIncrementalCrawling() ? Constants.TRUE : Constants.FALSE;
        form.dayForCleanup = fessConfig.getDayForCleanup();
        form.crawlingThreadCount = fessConfig.getCrawlingThreadCount();

     */
    @Override
    protected boolean isContentUpdated(final CrawlerClient client, final UrlQueue<?> urlQueue) {
        if (ComponentUtil.getFessConfig().isIncrementalCrawling()) {

            final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
            final long startTime = systemHelper.getCurrentTimeAsLong();

    }

    default void setIncrementalCrawling(final boolean value) {
        setSystemPropertyAsBoolean(Constants.INCREMENTAL_CRAWLING_PROPERTY, value);
    }

    default boolean isIncrementalCrawling() {
        return getSystemPropertyAsBoolean(Constants.INCREMENTAL_CRAWLING_PROPERTY, true);
    }

    default void setDayForCleanup(final int value) {