[{"Id":"a399f6c6-13b1-4060-8917-e99c54208165","Watchlists":[{"Id":"0fddfa7a-528d-4fa9-9019-e2f7d7699427","name":"MyWatchList","Symbols":[{"SymbolName":"USD","SymbolId":"0a61be6d-664f-4909-8743-83e202679abf"}]},{"Id":"04280f42-0c02-4deb-9c47-4c255efb58d8","name":"MyWatchList2","Symbols":[{"SymbolName":"EURO","SymbolId":"be2fe40c-e289-4ef6-b43e-28a6e72b296c"}]}]}]

db.collection.update({"Id":"a399f6c6-13b1-4060-8917-e99c54208165"},{$push:{"Watchlists.$[element].Symbols":{"SymbolName":"USD","SymbolId":"0a61be6d-664f-4909-8743-83e202679abf"}}},{arrayFilters:[{"element.Id":"04280f42-0c02-4deb-9c47-4c255efb58d8","element.Symbols":{"$not":{"$elemMatch":{"SymbolName":"USD"}}}}],upsert:true})