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

db.collection.aggregate([{$sort:{"hobbies.value":1}},{$set:{hobbies:{$sortArray:{input:"$hobbies",sortBy:{value:1}}}}}])