[{"_id":1,"name":"sam","age":20,"hobbies":[{"id":1,"value":"football"},{"id":2,"value":"chess"}]},{"_id":2,"name":"Bob","age":30,"hobbies":[{"id":1,"value":"painting"},{"id":2,"value":"gardening"}]},{"_id":3,"name":"Charlie","age":22,"hobbies":[{"id":2,"value":"playing the guitar"},{"id":3,"value":"photography"},{"id":1,"value":"cycling"}]}]

db.collection.aggregate([{$sort:{"hobbies.value":1}}])