Hi Adrien,
Thanks for the reply.
I am able to retrieve the child docId's using the .ToChildBlockJoinQuery.
Now for me to do aggregates i need to find the document using
reader.document(int docID) right?. If that is the case won't getting all
the documents would be a costly operation and then fina
It's not straightforward as we don't provide high-level tooling to do this.
You need to use the BitSetProducer that you pass to the
ToParentBlockJoinQuery in order to resolve the range of child doc IDs for a
given parent doc ID (see e.g. how ToChildBlockJoinQuery does it), and then
aggregate over t
