This API returns platform's with their ARN's. One ARN might look like this: "arn:aws:elasticbeanstalk:us-west-2::platform/Node.js running on 64bit Amazon Linux/4.0.0". This ARN can be passed in via the "SolutionStackName" parameter. Additionally, you can truncate the version and just specify "arn:aws:elasticbeanstalk:us-west-2::platform/Node.js running on 64bit Amazon Linux", and this should resolve to the latest 64bit Node JS platform available to you when creating or updating an environment.
SolutionStackNameパラメタとして
arn:aws:elasticbeanstalk:us-west-2::platform/Node.js running on 64bit Amazon Linux/4.0.0
のようにバージョンを明示せずに、
arn:aws:elasticbeanstalk:us-west-2::platform/Node.js running on 64bit Amazon Linux
と書けば、最新版が使われるとのことです。
知らなかった。。。。