Finding document_type?

I get a log message when elasticsearch starts that document_type is in use and is depreciated, etc. etc. I've read the docs on it and didn't think I was even using it since I started with 6.3.0 - but I still get the notice. I've grep'd all my ES/LS files for _type and I can't find it anywhere. I do have 2 references to @metadata like this.

filter {
fingerprint {
target => "[@metadata][fingerprint]"

that doesn't seem like that'd be the document_type though? maybe?

it's X-Pack that's doing it. It seems like it would be a decent idea to include that possibility in the error message.

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