// purge crawling sessions
        try {
            crawlingInfoService.deleteBefore(systemHelper.getCurrentTimeAsLong());
        } catch (final Exception e) {
            logger.error("Failed to purge crawling sessions.", e);
            resultBuf.append(e.getMessage()).append("\n");
        }

        // purge search logs
        try {

    public static final String PURGE_SEARCH_LOG_DAY_PROPERTY = "purge.searchlog.day";

    public static final String PURGE_USER_INFO_DAY_PROPERTY = "purge.userinfo.day";

    public static final String PURGE_JOB_LOG_DAY_PROPERTY = "purge.joblog.day";

    public static final String PURGE_BY_BOTS_PROPERTY = "purge.by.bots";

        setSystemPropertyAsInt(Constants.PURGE_SEARCH_LOG_DAY_PROPERTY, value);
    }

    default int getPurgeSearchLogDay() {
        return getSystemPropertyAsInt(Constants.PURGE_SEARCH_LOG_DAY_PROPERTY, DfTypeUtil.toInteger(Constants.DEFAULT_PURGE_DAY));
    }

    default void setPurgeJobLogDay(final int value) {
        setSystemPropertyAsInt(Constants.PURGE_JOB_LOG_DAY_PROPERTY, value);
    }

    public String execute() {
        try {
            final long count = ComponentUtil.getThumbnailManager().purge(getExpiry());
            return "Deleted " + count + " thumbnail files.";
        } catch (final Exception e) {
            logger.error("Failed to purge thumbnails.", e);
            return e.getMessage();
        }
    }

    public long getExpiry() {
        return expiry;
    }

        final LocalDateTime startTime = LocalDateTime.now();
        int ret = creator.create();
        if (ret == 0) {
            ret = creator.purge(startTime);
        }
        return ret;
    }

    private int create() {
        if (!ComponentUtil.getFessConfig().isSuggestDocuments() && !ComponentUtil.getFessConfig().isSuggestSearchLog()) {

    /** The key of the message: Purge Search Log Before */
    public static final String LABELS_purge_search_log_day = "{labels.purge_search_log_day}";

    /** The key of the message: Purge Job Log Before */
    public static final String LABELS_purge_job_log_day = "{labels.purge_job_log_day}";

    /** The key of the message: Purge User Before */

            }
            generatorList.add(generator);
        } else if (logger.isDebugEnabled()) {
            logger.debug("{} is not available.", generator.getName());
        }
    }

    public long purge(final long expiry) {
        if (!baseDir.exists()) {
            return 0;
        }
        try {
            final FilePurgeVisitor visitor = new FilePurgeVisitor(baseDir.toPath(), imageExtention, expiry);

    String PAGE_THUMBNAIL_QUEUE_MAX_FETCH_SIZE = "page.thumbnail.queue.max.fetch.size";

    /** The key of the configuration. e.g. 100 */
    String PAGE_THUMBNAIL_PURGE_MAX_FETCH_SIZE = "page.thumbnail.purge.max.fetch.size";

    /** The key of the configuration. e.g. 1000 */
    String PAGE_SCORE_BOOSTER_MAX_FETCH_SIZE = "page.score.booster.max.fetch.size";

      }

      @Override
      public String toString() {
        return "UnsignedBytes.lexicographicalComparator() (pure Java version)";
      }
    }

    /**
     * Returns the Unsafe-using Comparator, or falls back to the pure-Java implementation if unable
     * to do so.
     */
    static Comparator<byte[]> getBestComparator() {
      try {

        assertEquals(result, geoInfo.toQueryBuilder().toString().replaceAll("[ \n]", ""));
    }