Assume each document is a book:
{ title: "A", author: "Mike" }
{ title: "B", author: "Mike" }
{ title: "C", author: "Mike" }
{ title: "D", author: "Mike" }
{ title: "E", author: "John" }
{ title: "F", author: "John" }
{ title: "G", author: "John" }
{ title: "H", author: "Joe" }
{ title: "I", author: "Joe" }
{ title: "J", author: "Jack" }
What is the best way to fin the number of authors who have written between
2-3 books? In this case it would be 2, John and Joe.
I know I can do a terms aggregation on author, set size to be very very
large, and then on the client side traverse through the thousands of
authors and count how many had between 2-3. Is there a more efficient way
to do this? The cardinality aggregation is almost what I want, if only I
could specify a min and max term count.
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