Database
[{_id:ObjectId("63845afd1f4ec22ab0d11db9"),ticker:"ABCD",aggregates:[{date:"2022-05-20"},{date:"2022-05-20"},{date:"2022-05-20"}]}]
Query
db.collection.update({},{"$addToSet":{"aggregates":{date:"2022-05-20"}}})