[8.7](backport #35031) Fix performance issues with processors scaling under agent

[mergify]

This is an automatic backport of pull request #35031 done by Mergify.
Cherry-pick of ea1293f has failed:

On branch mergify/bp/8.7/pr-35031
Your branch is up to date with 'origin/8.7'.

You are currently cherry-picking commit ea1293fdb0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   CHANGELOG.next.asciidoc
	modified:   auditbeat/cmd/root.go
	modified:   heartbeat/cmd/root.go
	modified:   libbeat/cmd/instance/beat.go
	modified:   libbeat/monitoring/report/elasticsearch/elasticsearch.go
	modified:   libbeat/processors/config.go
	modified:   libbeat/publisher/pipeline/stress/run.go
	modified:   libbeat/publisher/processing/default.go
	modified:   libbeat/publisher/processing/default_test.go
	modified:   libbeat/publisher/processing/processing.go
	modified:   metricbeat/cmd/root.go
	modified:   packetbeat/cmd/root.go
	modified:   winlogbeat/cmd/root.go
	modified:   x-pack/auditbeat/cmd/root.go
	modified:   x-pack/filebeat/cmd/agent.go
	modified:   x-pack/filebeat/cmd/root.go
	modified:   x-pack/libbeat/management/managerV2.go
	modified:   x-pack/metricbeat/cmd/agent.go
	modified:   x-pack/metricbeat/cmd/root.go
	modified:   x-pack/osquerybeat/cmd/root.go
	modified:   x-pack/packetbeat/cmd/root.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   libbeat/management/management.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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• Start Time: 2023-04-12T14:29:55.691+0000

• Duration: 93 min 29 sec

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Passed	25971
Skipped	1968
Total	27939

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