The deprecation notice is incomplete. Elasticsearch and Kibana always work in pairs. You can use the former without the later but not the other way around. We do mention dropping and deprecating Elasticsearch elsewhere but it is missing from the following statement.

Deprecation notice
In Logging 5.9, Fluentd, and Kibana are deprecated and are planned to be removed in Logging 6.0, which is expected to be shipped alongside a future release of OpenShift Container Platform. Red Hat will provide critical and above CVE bug fixes and support for these components during the current release lifecycle, but these components will no longer receive feature enhancements. The Vector-based collector provided by the Red Hat OpenShift Logging Operator and LokiStack provided by the Loki Operator are the preferred Operators for log collection and storage. We encourage all users to adopt the Vector and Loki log stack, as this will be the stack that will be enhanced going forward.

ref: https://docs.openshift.com/container-platform/4.15/observability/logging/logging_release_notes/logging-5-9-release-notes.html

If we feel our other statements correctly cover everything we wish to state about Elasticsearch then this statement should be altered to remove "Kibana", otherwise, we should add "Elasticsearch" to the statement to be accurate.