Dune

{:etype "book",
 :doc
 {:isbn "978-0441172719",
  :year 1965,
  :genre "Science Fiction",
  :pages 688,
  :title "Dune",
  :author {:id "4ZXHPr", :etype :author, :title "Frank Herbert"},
  :rating 5},
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  [:rating [:int {:default 0, :min 0, :max 5}]]]}