x-pack/filebeat/input/cel: document surprising number behaviours

[efd6]

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• [ ] 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
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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• For #43659

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[github-actions[bot]]

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @efd6? 🙏. For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

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
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

[efd6]

That's not the int() conversion. That's the final serialisation. int values within an evaluation context are always represented as Go int64.

[github-actions[bot]]

🔍 Preview links for changed docs

• docs/reference/filebeat/filebeat-input-cel.md