Types Removal

I've previously posted a question about this, but waited too long to respond and the topic got closed.

I've read the notice about types being removed, but I can't figure it out. I'm getting a warning in my deprecation log about it, but I don't understand what I'm looking for. I know I can reindex offending indices, but how do I find the indices that are using this deprecated setting?

I've added _type back into the meta-fields section of Kibana>Settings>Advanced Settings and see indices do indeed have a type of _doc. Is this ok, how did these indices get a document type added as I don't have it specified? Running Elastic Stack 7.7.0 at the moment.

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