Database
[{"_id":"61c01098bc29520008efc00f","name":"codedump","employments":[{"type":"PERMANENT","salary":1000000000},{"type":"TEMP","salary":1000000000},{"type":"PART_TIME","salary":1000000000},]}]
Query
db.collection.update({},{"$push":{"employments":[{"type":"INVESTMENT","salary":10000}]}},{"multi":false,"upsert":false})