Shuts down one or more instances. This operation is idempotent; if you terminate an instance more than once, each call succeeds. Terminated instances remain visible after termination (for approximately one hour). By default, Amazon EC2 deletes all EBS volumes that were attached when the instance launched. Volumes attached after instance launch continue running. You can stop, start, and terminate EBS-backed instances. You can only terminate instance store-backed instances. What happens to an instance differs if you stop it or terminate it. For example, when you stop an instance, the root device and any other devices attached to the instance persist. When you terminate an instance, any attached EBS volumes with the DeleteOnTermination block device mapping parameter set to true are automatically deleted. For more information about the differences between stopping and terminating instances, see Instance Lifecycle in the Amazon EC2 User Guide.

public static Task<bool> TerminateEC2Instances(this ICakeContext context, IList<string> instances, EC2Settings settings)