[8.15](backport #40692) [Processor\Script] Add option to prevent creation of new sessions #40793
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Fixes #40690
Proposed commit message
Include an option called
only_cached_sessions
that causes the script processor to only use the pre-defined cached javascript sessions from the session pool. This option is off by default. Includes some unrelated fixes for lint errors related to unchecked errors returned by called functions.Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.Disruptive User Impact
No
Use cases
Prevent the Beat from temporarily allocating and deleting hundreds of javascript sessions during normal operation.
Allows using more expensive Javascript scripts knowing they will only undergo initialization a single time.
Allows funneling all Beat events through a single session
This is an automatic backport of pull request #40692 done by [Mergify](https://mergify.com).