[Filebeat] updating netflow to ecs 1.10.0

[P1llus]

What does this PR do?

Updates to ECS 1.10.0. Changelog entry will come later, so there is no conflict between the other ECS PR changes

Why is it important?

Keeps the modules consistent with the current ECS versions.

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

Related issues

• Relates [ECS] Upgrade modules to ECS 1.10 #25734

[elasticmachine]

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

[elasticmachine]

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• Build Cause: P1llus commented: run tests

• Start Time: 2021-05-31T07:11:45.180+0000

• Duration: 26 min 3 sec

• Commit: 62b225e

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[P1llus]

run tests