Specify Java version of Enterprise Search

Elastic Search
1

Hi all,

I have a RHEL 7 VM with Enterprise Search 8.9.2 (Tarball) and Java 1.8. In the documentation Unterstützungsmatrix | Elastic I can read that my Enterprise Search 8.9.2 should support OpenJDK Java 1.8. But When I start with ./bin/enterprise-search I' got the error message that Java 11 is required. So, the documentation may be wrong.

How ever, I can't start my Enterprise Search. Is there a way to run different Java versions on a VM and configure the Java version which is used by Enterprise Search? Due to another on my VM, software which can only use Java 1.8, I have to my plan is to setup Java 11 parallel to 1.8 and let Enterprise Search know, to use Java 11.

Best regards

Sebastian

2

So, the documentation may be wrong.

Indeed. That looks wrong as nobody should be using Java 8 anymore.

They are not updated with the latest security patches and are not recommended for use in production.

I'm going to raise an issue internally.

3

Is there a way to run different Java versions on a VM and configure the Java version which is used by Enterprise Search?

@sebastianboelling you can install multiple java versions on your VM and use environment variables (like JAVA_HOME) to signal which one an environment should use. For development, our team has also leveraged a tool called jEnv which can help you manage multiple java installs.

I can read that my Enterprise Search 8.9.2 should support OpenJDK Java 1.8

David got our team's attention, and we'll work to get that compatibility matrix updated. I will assure you that this is a documentation error, and that only Java 11 is intended to be supported at this time. You can see it listed as a prerequisite in our product documentation: Run Enterprise Search server using downloads (packages) | Enterprise Search documentation [8.11] | Elastic

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OK thank you. In which configuration of Enterprise Search file I can (should) set the JAVA_HOME?

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You can set environment variables in enterprise-search*/config/env.sh, or you could set them in whatever script/tool you're using to run bin/enterprise-search (might be a Docker entrypoint, a bash script, a service script, etc)

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