Liferay Tomcat Bundles and Docker Images ship with Elasticsearch 8.18 as the sidecar search engine.
Benefits
The Elasticsearch server runtime included in Liferay DXP Tomcat Bundles and Docker Images (aka. Sidecar Elasticsearch, located under [Liferay-Home]/elasticsearch-sidecar) is provided as a convenience for local development and testing only. It is neither suitable nor supported for production.
Instead, configure Liferay to connect to Elasticsearch as a self-managed, standalone server or cluster of server nodes.