Fix bugs in ES Grafana dashboard

Change-Id: I6aeb8ebe3ccf1ad6e753339a98efaa9811c92757
diff --git a/elasticsearch/files/grafana_dashboards/elasticsearch_prometheus.json b/elasticsearch/files/grafana_dashboards/elasticsearch_prometheus.json
index bfb92dd..f490248 100644
--- a/elasticsearch/files/grafana_dashboards/elasticsearch_prometheus.json
+++ b/elasticsearch/files/grafana_dashboards/elasticsearch_prometheus.json
@@ -1863,10 +1863,10 @@
         "multi": false,
         "name": "host",
         "options": [],
-        "query": "query_result(elasticsearch_os_load_average)",
+        "query": "query_result(elasticsearch_up)",
         "refresh": 1,
         "refresh_on_load": true,
-        "regex": ".*,host=\"(.+?\\d+)\".*",
+        "regex": ".*host=\"(.+?\\d+)\".*",
         "sort": 1,
         "tagValuesQuery": "",
         "tags": [],