Elasticsearch X-Pack Alerting or aka Watcher offers the capability to alert on specific events/constellation in the Elasticsearch data. Watcher can retrieve data from the cluster where it runs (on the master node), or fetch data from Restful Web-Services via the http input. Preferably having a production cluster, you should report the monitoring data to a dedicated Elasticsearch monitoring cluster. This monitoring cluster can also run watches. The watch I’am going to introduce is the cluster health watch.