[8.15](backport #40572) [libbeat] Stop publisher properly #40617
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Proposed commit message
We avoided closing the publisher on Stop to avoid races with the ES output since we were not aborting the active connections. This adds:
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.Disruptive User Impact
Related issues
This is an automatic backport of pull request #40572 done by [Mergify](https://mergify.com).