mutate filter should keep fields the same type

Description

Right now, you can mutate @tags and replace it with a string. That's not awesome.

I was going to say "Always keep @tags an array" but really it's better to say "Always keep arrays as arrays" - so a replace on an array should make it a single-element array... etc

Assignee

Logstash Developers

Reporter

Jordan Sissel

Labels

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Affects versions

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