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It seems that the mapping has not been processed on every shard in the same manner. IIRC it can happen on old version when 2 requests goes to 2 shards in parallel and updates the mapping at the same time.
This has been fixed in recent version.
I don't know how you can identify this though.
A way to solve the issue in the future, may be send the mapping in advance when you create your index so you are sure it's propagated to all nodes/shards.
Or upgrade 