Can I sort has_child query result by child's numeric field?

I found this:


it use custom_score, but it can not work at version 1.2.1.
I try to use function_score, but get exception:
nested: PropertyAccessException[[Error: could not access: offer; in class:
org.elasticsearch.search.lookup.DocLookup]\n[Near : {...
doc[offer.price].value ....}
"offer" is the child's index type.
Please some one know that, help me, thanks!

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