Changing Java version in the officail docker image

Hi there,
I am using ES 6.8 in a docker container.

Now, this docker images is using Java 12, and this is causing some bad reports from our security department.
Seems only approved versions are LTS ones. I think i want to change it to Java 11

So my question is :
How can i change the Java version inside the container/image ?

Second question is:
Can i change the version one by one? This will result cluster with different java version at at a time.

Or do i need to shut-down the whole cluster ?

Thank you in advance

You'd need to build your own docker image for this, it's not something that we support with the images we release.
Otherwise, upgrade to 7.13 and you will have a newer JVM.

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