I see that the S3 output has had the role_arn parameter documented since plugin version 4.1.0 (https://www.elastic.co/guide/en/logstash/current/plugins-outputs-s3.html#plugins-outputs-s3-role_arn) however I can't find any code in the plugin to actually support this functionality, nor can I get it to work.
Is this planned functionality which hasn't been implemented yet? Thanks for any information you can provide!