Add Elasticsearch to Grafana

This patch adds Elasticsearch to Grafana as a data source

Change-Id: I7c6452bba47274f9d971b8000e9d3e911617874d

ansible/roles/grafana/defaults/main.yml

@@ -34,6 +34,17 @@ grafana_data_sources:
       url: "{{ internal_protocol }}://{{ api_interface_address }}:{{ influxdb_http_port }}"
       access: "proxy"
       basicAuth: false
+  elasticsearch:
+    enabled: "{{ enable_elasticsearch | bool }}"
+    data:
+      name: "elasticsearch"
+      type: "elasticsearch"
+      access: "proxy"
+      url: "{{ internal_protocol }}://{{ kolla_internal_vip_address }}:{{ elasticsearch_port }}"
+      database: "flog-*"
+      jsonData:
+        esVersion: 5
+        timeField: "@timestamp"
 
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 # Grafana