[ES5.1] Query for documents that are present in index A, but not in index B


I have index A and index B. Index B is a botched reindex of A. Problem is, index B now contains new data I can't lose. So I have documents that are present in A, or B or A&B. I will fix this by running another reindex, with a proper options (skip existing in destination), but I need some form of verification.

I want to query across the two indices, which is easy with Elastic. But I want to get only the documents in index A, which are not present in index B, preferably by ID. I can't quite figure out the query, can anyone help?

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