Effective in version 10.4.0, new advanced properties are available when you configure a Create Cluster task with an Amazon EMR connection in a workflow.
You can configure the following functionality on a Create Cluster task:
Root device EBS volume size. The number of GB of the EBS root device volume.
Custom AMI ID. ID of a custom Amazon Linux Amazon Machine Image (AMI).
Security Configuration. The name of a security configuration for authentication and encryption on the cluster.