feat(elasticsearch): improve post install notes (#623)

Author: michaeljguarino

elasticsearch/plural/notes.tpl

@@ -1 +1,11 @@
-Use `plural watch datahub` to track the status of your application
+Use `plural watch elasticsearch` to track the status of your application.  When it's fully provisioned, you can fetch the creds by running:
+
+```
+kubectl get secret elasticsearch-es-elastic-user -n elasticsearch -o go-template --template="{{.data.elastic | base64decode}}"
+```
+
+The username will always be `elastic`.
+
+We also deploy a kibana instance available at {{ .Values.hostname }}
+
+