Converting from 2.x to 5.x: "type": "string", "index": "no" -- use type or keyword?

I know that in elasticsearch 5, the string field is no more. From this blog post: I understand when to use text and when to use keyword when "index": "analyzed" or "index": "not_analyzed".

But what should we use when "type": "string", "index": "no"? Does it matter?



If you want to aggregate or sort by the field, I think the "keyword" datatype is better because of "doc_values": true by default.
If not, maybe either is fine.


I'd use text in that case with index: false

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Thanks to both of you for your replies -- appreciate it! I decided to consistently use keyword in the end.

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