final FieldMappingMetadata fieldMappings = gfmResponse.fieldMappings(index, field);
        if (fieldMappings == null) {
            try {
                final AcknowledgedResponse pmResponse =
                        indicesClient.preparePutMapping(index).setSource(source, XContentType.JSON).execute().actionGet();
                if (pmResponse.isAcknowledged()) {

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

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

                                .actionGet(fessConfig.getIndexIndicesTimeout());
                        final GetIndexResponse response =
                                client.admin().indices().prepareGetIndex().addIndices(fessConfig.getIndexDocumentUpdateIndex()).execute()
                                        .actionGet(fessConfig.getIndexIndicesTimeout());

                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);

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

    protected Function<Map<String, Object>, Long> requestHandler = params -> {

                    esClient.admin().cluster().prepareNodesHotThreads().setIgnoreIdleThreads(ignoreIdleThreads).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 -> {

        final SearchResponse countResponse = searchEngineClient.prepareSearch(fessConfig.getIndexDocumentUpdateIndex())
                .setQuery(queryBuilder).setSize(0).setTrackTotalHits(true).execute().actionGet(fessConfig.getIndexSearchTimeout());
        final TotalHits totalHits = countResponse.getHits().getTotalHits();
        if (totalHits != null) {
            return totalHits.value;
        }
        return 0;

        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();

                final String index = fessConfig.getIndexDocumentUpdateIndex();
                searchEngineClient.admin().indices().prepareRefresh(index).execute().actionGet();
                final long numOfDeleted = searchEngineClient.deleteByQuery(index, queryBuilder);
                logger.info("Deleted {} old docs.", numOfDeleted);
            } catch (final Exception e) {