.addSort("timestamp", SortOrder.ASC)
                .execute()
                .actionGet(fessConfig.getIndexSearchTimeout());

        final SearchHit[] hits = searchResponse.getHits().getHits();
        if (hits.length == 0) {
            return "No log notifications.";
        }

        final List<LogNotificationEvent> events = new ArrayList<>();
        final List<String> docIds = new ArrayList<>();

        int count = 0;
        String scrollId = response.getScrollId();
        try {
            while (scrollId != null) {
                final SearchHits searchHits = response.getHits();
                final SearchHit[] hits = searchHits.getHits();
                if (hits.length == 0) {
                    break;
                }

                final BulkRequestBuilder bulkRequest = client.prepareBulk();