[fix][metricbeat] Change default value for server_status_path in nginx module

[marc-gr]

What does this PR do?

Fixes the default path for the nginx module from server-status to nginx_status

Why is it important?

If set by default the endpoint will return a 404

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.

[elasticmachine]

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• Start Time: 2021-08-02T10:00:57.912+0000

• Duration: 78 min 54 sec

• Commit: 37a22d0

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Total	11448

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[andrewkroh]

Is this a breaking change for users that were relying on the default? Or would no one be using the default?

[marc-gr]

Is this a breaking change for users that were relying on the default? Or would no one be using the default?

From my understanding, this change was intended to happen here #14730, but was missing the bits in this PR. I'd like @kaiyan-sheng to confirm both my assumption and if it is a breaking change, and in that case how we should proceed.

[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 fix-nginx-status-path upstream/fix-nginx-status-path
git merge upstream/master
git push upstream fix-nginx-status-path

[kaiyan-sheng]

@marc-gr Sorry maybe the original PR from the community shouldn't be merged. Seems like this is not simply a documentation change but since the existing default path causes a 404 error, I would consider it as a bug fix instead of breaking change.

[elasticmachine]

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

[kaiyan-sheng]

Thank you for fixing this!