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"…

How to find the number of authors who have written between 2-3 books?

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How to find the number of authors who have written between 2-3 books?