[filebeat/netflow]: set event normalisation to true

[pkoutsovasilis]

Proposed commit message

This PR enables event normalisation for netflow input and solves this this issue. Specifically the netflow input in 8.13 had a refactor to transition to plugin.V2 and during this it was deemed as safe to disable event normalisation and thus improve the performance. However the produced events contain ip fields that cause similar errors to this following without normalisation enabled

Apr 02 13:57:11 tv filebeat[597]: {"log.level":"warn","@timestamp":"2024-04-02T13:57:11.590Z","log.logger":"elasticsearch","log.origin":{"function":"github.com/elastic/beats/v7/libbeat/outputs/elasticsearch.(*Client).bulkCollectPublishFails","file.name":"elasticsearch/client.go","file.line":454},"message":"Cannot index event (status=400): dropping event! Enable debug logs to view the event and cause.","service.name":"filebeat","ecs.version":"1.6.0"}

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.

Author's Checklist

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How to test this PR locally

Follow the steps in the issue #38703

Related issues

• Relates [Filebeat] Netflow data indexing failures after upgrading to 8.13 #38703

Use cases

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Logs

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @pkoutsovasilis? 🙏.
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-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b pkoutsovasilis/fix_netflow_event_normalisation upstream/pkoutsovasilis/fix_netflow_event_normalisation
git merge upstream/main
git push upstream pkoutsovasilis/fix_netflow_event_normalisation

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Pinging @elastic/sec-deployment-and-devices (Team:Security-Deployment and Devices)

[elasticmachine]

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