I did an internal upgrade of AWS Elasticsearch from 7.1 to 7.10. The docs suggested this should be seemless. It appeared so on the console. All went well I could see the version green checked at 7.10.
However, I could no longer access Kibana. There was no mention of changing URLs or anything like that.
Interestingly about 12 hours later I could access Kibana with all the original tools and URLs. I assumed that I should have access as soon as AWS displayed that the search was active.
At the moment it is, though I am using 7.10.2 on AWS. If OpenSearch adds this feature will will likely make the effort to move to the latest version of OpenSearch. That move will require a bit of work.