Copy document if fields are different

Hey Everyone,

I have two indices which overlap with data, but there are some differences.
What I would like, is to copy documents from index1 to index2, where index1.someField != index2.someField. someField being a custom unique field which can be used for scripting here.

So for every document in index1, it would need to check if a document already exists in index2 with the same someField value, and skip that document if it does exist.
Basically, copying index1 to index2, but avoiding duplicates.

Could this be done with a combination of painless and a reindex, or is there some other/better way to do this? Any help would be greatly appreciated.


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