You are looking at preliminary documentation for a future release. Not what you want? See the current release documentation.
Support for using
JAVA_HOME to override the path to the JDK that Logstash runs with has been removed for this release.
8.x release, users should set the value of
LS_JAVA_HOME to the path of their preferred JDK if they
wish to use a version other than the bundled JDK. The value of
JAVA_HOME will be ignored.
Intro to Kibana
ELK for Logs & Metrics