If you want to use the bundled JVM you don't need to set it.
If you don't, and want to use your own version (eg an updated one), see Install Elasticsearch with Debian Package | Elasticsearch Guide [8.11] | Elastic
If you want to use the bundled JVM you don't need to set it.
If you don't, and want to use your own version (eg an updated one), see Install Elasticsearch with Debian Package | Elasticsearch Guide [8.11] | Elastic