eks_node_group does not select correct default release_version on version upgrade

[Nuru]

I have issues

I'm submitting a...

• bug report
• feature request
• support request - read the FAQ first!
• kudos, thank you, warm fuzzy

What is the current behavior?

When upgrading a node group from Kubernetes 1.15 to 1.16 and setting release_version = null, the upgrade fails because the selected Release Version is a 1.15 version, not a 1.16 version.

Error: error updating EKS Node Group (test-cluster:test-eks-us-east-2a-workers) version: InvalidParameterException: Requested Nodegroup release version 1.15.10-20200228 is invalid. Allowed release version is 1.16.8-20200531

If this is a bug, how to reproduce? Please include a code sample if relevant.

• Create an EKS cluster using resource "aws_eks_cluster" using version = "1.15"
• Create a node group in that cluster using resource "aws_eks_node_group" with release_version = null and version = "1.15"
• Upgrade the cluster by changing "aws_eks_cluster" to version = "1.16"
• Upgrade the node group by changing "aws_eks_node_group" to version = "1.16"

What's the expected behavior?

Node group is upgraded to latest 1.16 release AMI

Are you able to fix this problem and submit a PR? Link here if you have already.

No

Environment details

• Affected module version: AWS 2.64.0
• OS: Alpine 3.11.6
• Terraform version: 0.12.26

Any other relevant info

[Nuru]

Sorry, this is an upstream issue hashicorp/terraform-provider-aws#12675

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.