Associates the specified AWS Key Management Service (AWS KMS) customermaster key (CMK) with the specified log group.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/logs/associate-kms-key.html
aws logs associate-kms-key --log-group-name my-log-group --kms-key-id "key-arn" |
| Encrypt Log Data in CloudWatch Logs Using AWS KMS - Amazon CloudWatch Logs : http://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/encrypt-log-data-kms.html |