[{"_id":{"$oid":"60e544a5e0762b0b2ef6657e"},"user0":"a","details":[{"name":"jon","things":[{"name":"car","work":"travel"},{"name":"phone","work":"network"}]},{"name":"steve","things":[{"what":"car","work":"travel"},{"what":"phone","work":"network"}]}]}]

db.collection.update({},{$push:{"details.$[elem].things":{"what":"plane","work":"home"}}},{arrayFilters:[{"elem.name":"steve"}]})