[{"_id":ObjectId("6036953aec9d2a3612452bae"),"name":"Chris","friends":[{"name":"xyz","age":23},/** delete*/{"name":"xyz","age":34},/** delete*/{"name":"abc","age":18},{"name":"pqr","age":27}/** delete*/],}]

db.collection.update({"name":"Chris"},{"$pull":{"friends":{"name":{"$in":["xyz","pqr"]}}}})