[8.x] Limit memory consumption in test on overflow (backport #17373) #17411
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Updates only test code to be able to run a test that consumes big memory if: - the physical memory is bigger than the requested Java heap - JDK version is greater than or equal to 21. The reason to limit the JDK version is that on 16GB machine the G1GC is more efficient than the one on previous JDKs and so let complete the test with 10GB heap, while in JDK 17 it consistently fails with OOM error. (cherry picked from commit 075fdb4)
andsel force-pushed the mergify/bp/8.x/pr-17373 branch from 70ac8de to d334f0a Compare 
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Release notes
[rn:skip]
What does this PR do?
Updates only test code to be able to run a test that consumes big memory if:
The reason to limit the JDK version is that on 16GB machine the G1GC is more efficient than the one on previous JDKs and so let complete the test with 10GB heap, while in JDK 17 it consistently fails with OOM error.
Why is it important/What is the impact to the user?
N/A
Checklist
[ ] I have made corresponding changes to the documentation[ ] I have made corresponding change to the default configuration files (and/or docker env variables)Author's Checklist
How to test this PR locally
https://buildkite.com/elastic/logstash-exhaustive-tests-pipeline/builds/1569https://buildkite.com/elastic/logstash-exhaustive-tests-pipeline/builds/1594Related issues
This is an automatic backport of pull request #17373 done by [Mergify](https://mergify.com).