Database
[{"_id":ObjectId("61603458c08ad41af13bf352"),"messages":[{"type":"01.04.2020 15:27:23","message":"This is a 1 Msg","direction":"0"},{"type":"05.04.2020 03:27:23","message":"This is a 2 Msg","direction":"0"}]}]
Query
db.collection.update({"_id":ObjectId("61603458c08ad41af13bf352"),"messages.type":"05.04.2020 03:27:23"},{$set:{"messages.$[m].direction":"999"}},{multi:true,arrayFilters:[{"m.type":"05.04.2020 03:27:23"}]})