About an hour ago, I tried updating my on prem 7.10.2 dev cluster (RHEL 8, 15 nodes) to 7.11.0.
On the first node I ran yum update on, when I restarted Elasticsearch, it failed. I looked at journalctl and saw errors related to LDAP. Doing some searching led me to the following discussion on Elastic's GitHub: Fix permissions for UnboundID LDAP SDK by jasontedor · Pull Request #68872 · elastic/elasticsearch · GitHub .
I wanted to surface this issue for anyone else in the community who uses LDAP with realms for authentication and is considering an upgrade to 7.11.0. It looks like we need to wait for 7.11.1.