I've got a situation where running a top_children query returns no
results; running the same query wrapped in a has_child returns the
expected result. I know that top_children may miss parent document
results in the case where there are lots of matching children per
parent; but since in this case top_children returns nothing at all, it
seems that that's not what's going on.
I can try to put together a reduction, but first just wanted to make
sure my understanding of top_children/has_child is correct, and that
what I'm describing is not expected behavior.