ElasticSearch Alert With Grafana

I am new to Grafana so pardon me for novice issues. :slight_smile:
I am facing an issue when setting up an alerting for elasticsearch in grafana. When I go and edit my panel to setup an alert, I get “The datasource doesn’t support alert queries”. I am using elasticsearch to pull the data and as I understand, Grafana does support alerts on ES queries.

I am using Grafana 6.4.3: image

Is there any step that I am missing? Which part should I look into to resolve this issue?