logstash Reimplemented Ruby's CoercibleString setting into Java

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What does this PR do?

Why is it important/What is the impact to the user?

Checklist

[ ] My code follows the style guidelines of this project
[ ] I have commented my code, particularly in hard-to-understand areas
[ ] I have made corresponding changes to the documentation
[ ] I have made corresponding change to the default configuration files (and/or docker env variables)
[ ] I have added tests that prove my fix is effective or that my feature works

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How to test this PR locally

Related issues

Closes #18186

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Sep 18 '25 15:09 andsel

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Just comment with:

run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

Sep 18 '25 15:09 github-actions[bot]

This pull request does not have a backport label. Could you fix it @andsel? 🙏 To fixup this pull request, you need to add the backport labels for the needed branches, such as:

backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
If no backport is necessary, please add the backport-skip label