final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
                if (bulkResponse.hasFailures()) {
                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
                }

                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);

                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
                if (bulkResponse.hasFailures()) {
                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
                }

                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);

                client.admin().indices().prepareGetIndex().addIndices(updateAlias).execute().actionGet(fessConfig.getIndexIndicesTimeout());
        final String[] updateIndices = response1.indices();
        final GetIndexResponse response2 =
                client.admin().indices().prepareGetIndex().addIndices(searchAlias).execute().actionGet(fessConfig.getIndexIndicesTimeout());
        final String[] searchIndices = response2.indices();

                final BulkResponse bulkResponse = bulkRequest.execute().actionGet(bulkTimeout);
                if (bulkResponse.hasFailures()) {
                    throw new IllegalBehaviorStateException(bulkResponse.buildFailureMessage());
                }

                response = client.prepareSearchScroll(scrollId).setScroll(scrollForDelete).execute().actionGet(scrollSearchTimeout);

                    .setInterval(interval)
                    .setThreads(threads)
                    .setTimeout(timeout)
                    .setType(type)
                    .execute()
                    .actionGet(timeout);
            append(buf, "cluster_name", () -> response.getClusterName().value()).append(',');
            final String hotThreads = response.getNodesMap().entrySet().stream().map(e -> {

                    bulkRequest.add(client.prepareIndex().setIndex(indexName).setSource(source));
                }
                final BulkResponse response = bulkRequest.execute().actionGet(30_000L);
                if (response.hasFailures()) {
                    logger.warn("Failed to write log notifications: {}", response.buildFailureMessage());
                }
            }

                .setFetchSource(false)
                .setSize(fessConfig.getPageScoreBoosterMaxFetchSizeAsInteger())
                .execute()
                .actionGet(requestTimeout);
        return Arrays.stream(response.getHits().getHits()).map(SearchHit::getId).toArray(n -> new String[n]);
    };

    /**
     * A function to handle requests.
     */

                .setQuery(QueryBuilders.termQuery("hostname", hostname))
                .setSize(searchSize)
                .addSort("timestamp", SortOrder.ASC)
                .execute()
                .actionGet(fessConfig.getIndexSearchTimeout());

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

        try {
            final SearchEngineClient client = ComponentUtil.getSearchEngineClient();
            final NodesStatsResponse response = client.admin().cluster().prepareNodesStats().addMetric("os").execute().actionGet(10000L);

            short maxCpu = 0;
            for (final NodeStats nodeStats : response.getNodes()) {
                final OsStats os = nodeStats.getOs();
                if (os != null && os.getCpu() != null) {

        try {
            final SearchEngineClient esClient = ComponentUtil.getSearchEngineClient();
            final NodesStatsResponse response = esClient.admin().cluster().prepareNodesStats().all().execute().actionGet(10000L);
            final XContentBuilder builder = XContentFactory.jsonBuilder();
            builder.startObject();
            response.toXContent(builder, ToXContent.EMPTY_PARAMS);
            builder.endObject();