final long cleanupDay = ComponentUtil.getFessConfig().getPurgeSuggestSearchLogDay();
            if (cleanupDay > 0) {
                suggestHelper.purgeSearchlogSuggest(time.minusDays(cleanupDay));
            }
            return 0;
        } catch (final Exception e) {
            logger.warn("Failed to purge suggest data.", e);
            return 1;
        }
    }