x-pack/filebeat/processors/decode_cef - Fix ECS observer.ip

[andrewkroh]

What does this PR do?

Fix the ECS output format by making observer.ip into an array of strings instead of string.

Fixes #35140

Why is it important?

Filebeat should follow the ECS definition precisely.

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
• 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.

Related issues

• Closes Decode_cef Processor needs to set observer.ip as array #35140

Local Testing

cd x-pack/filebeat && PYTEST_ADDOPTS="-k test_xpack_modules" TESTING_FILEBEAT_MODULES=cef GENERATE=true mage -v pythonIntegTest

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-04-20T18:12:05.807+0000

• Duration: 73 min 33 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2883
Skipped	175
Total	3058

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

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[efd6]

CHANGELOG?

[andrewkroh]

CHANGELOG?

It has a CHANGELOG.next.asciidoc entry 👍 .

[efd6]

I am obviously blind.