[{"key":"TP-1","audit":{"total":1,"histories":[{"id":"1000","created":"2020-08-06T08:33:57.977+0530","items":[{"field":"status","from":"To Do","to":"Done"}]},{"id":"2000","created":"2020-05-08T04:13:27.977+0530","items":[{"field":"summary","from":"a","to":"b"}]}]}},{"key":"TP-2","audit":{"total":1,"histories":[{"id":"1001","created":"2020-07-31T10:15:50.184+0530","items":[{"field":"status","from":"Done","to":"To Do"},{"field":"status","from":"To Do","to":"Done"}]}]}}]

db.collection.aggregate([{$match:{$or:[{"audit.histories.items.to":{"$eq":"Done"}},{"audit.histories.items.from":{"$eq":"Done"}}]}},{$unwind:{path:"$audit.histories"}},{$match:{$expr:{$gt:[{"$dateToString":{"date":{$toDate:"$audit.histories.created"},"format":"%Y-%m-%d"}},"2020-04-28"]}}},{$group:{_id:"$key"}}])