Create a span for a nested action invocation via chain result

[tobiasstadler]

What does this PR do?

If the result of an action invocation is a action chain, start a new span for the new action invocation.

Checklist

• This is an enhancement of existing features, or a new feature in existing plugins
  • I have updated CHANGELOG.asciidoc
  • I have added tests that prove my fix is effective or that my feature works
  • Added an API method or config option? Document in which version this will be introduced
  • I have made corresponding changes to the documentation

[github-actions]

👋 @tobiasstadler Thanks a lot for your contribution!

It may take some time before we review a PR, so even if you don’t see activity for some time, it does not mean that we have forgotten about it.

Every once in a while we go through a process of prioritization, after which we are focussing on the tasks that were planned for the upcoming milestone. The prioritization status is typically reflected through the PR labels. It could be pending triage, a candidate for a future milestone, or have a target milestone set to it.

[tobiasstadler]

@eyalkoren Would you mind having a look please?

[ghost]

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• Start Time: 2022-05-18T07:16:17.460+0000

• Duration: 47 min 22 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2873
Skipped	22
Total	2895

💚 Flaky test report

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[tobiasstadler]

ping

[SylvainJuge]

Hi @tobiasstadler !

We haven't forgotten about this PR, but there was quite a few more urgent things to deal with, part of the team (me included) will be on PTO in the following weeks, so it's very hard to give you an ETA on this.

[tobiasstadler]

ping

[felixbarny]

looks like a useful, simple and non-contentious enhancement

[felixbarny]

/test

[felixbarny]

run elasticsearch-ci/docs

[tobiasstadler]

Thank You!