Lynn Luo

Thank you for reaching out, currently we do not support associating encryption config to EKS Clusters through Cloudformation after cluster creation. Please refer to Cloudformation [document](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-eks-cluster.html#cfn-eks-cluster-encryptionconfig) for property update requires...

seems to be a duplicate of https://github.com/hashicorp/terraform-provider-aws/pull/42134