@Override
    public void expired() {
        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();

        String stats = 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);