Describe the Feature

SSM allows folks to connect to an instance without the need for ssh.

This is described here: https://aws.amazon.com/blogs/big-data/securing-access-to-emr-clusters-using-aws-systems-manager/

Expected Behavior

Users and roles with permission to start and attach to ssm sessions should be able to remotely manage emr clusters.

Use Case

Most emr clusters need some initial boot operations to set things up

Describe Ideal Solution

Not only is ssm a possible flag, but also adding more boot actions is supported via s3 objects or even plain text.