I'm trying to do a query with a range facet that has the key field come from
the parent document and the value field values come from all nested
documents. Here's a gist of the idea
What I'm hoping for is to have each rating range facet have the min, max,
average, etc of the prices within the nested document of the matching
Now that I look at it again at the nested facet documentation, I'm thinking
this isn't possible, but I'd loved to be proved wrong.