[Backport] Doc: Add bundled JDK info (#12417)

Document options and impacts of bundled JDK

Backports: #12369
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Karen Metts 2020-11-05 12:45:57 -05:00 committed by GitHub
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* Java 11
* Java 14
See the https://www.elastic.co/support/matrix#matrix_jvm[Elastic Support Matrix]
for the official word on supported versions across releases.
Use the
http://www.oracle.com/technetwork/java/javase/downloads/index.html[official
Oracle distribution] or an open-source distribution, such as
http://openjdk.java.net/[OpenJDK].
See the https://www.elastic.co/support/matrix#matrix_jvm[Elastic Support Matrix]
for the official word on supported versions across releases.
.Bundled JDK
[NOTE]
=====
{ls} offers architecture-specific
https://staging-website.elastic.co/downloads/logstash[downloads] that include
AdoptOpenJDK 11, the latest long term support (LTS) release of JDK.
Use the JAVA_HOME environment variable if you want to use a JDK other than the
version that is bundled.
If you have the JAVA_HOME environment variable set to use a custom JDK, Logstash
will continue to use the JDK version you have specified, even after you upgrade.
=====
[float]
[[check-jvm]]