AWS specific options have been dropped in the Elasticsearch sink

The endpoint and region options have been dropped in the elasticsearch sink in favor of using the host option.

Upgrade Guide

 [sinks.es]
   type = "elasticsearch"
-  endpoint = "http://my-domain.us-east-1.es.amazonaws.com"
-  region = "us-east-1"
+  host = "http://my-domain.us-east-1.es.amazonaws.com"

You can find your AWS ES domain in the AWS console. Simply provide the full domain URL as the host value.