[{_id:140,first_list:[{_id:ObjectId("623db7e840651f2b7f107ee0"),second_list:[{_id:ObjectId("6241808340651f2b7f108123"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z")},{_id:ObjectId("6241809640651f2b7f108125"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z")},{_id:ObjectId("624180ac40651f2b7f108127"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z")}]},{_id:ObjectId("623db7e840651f2b7f107ee2"),second_list:[{_id:ObjectId("6241808340651f2b7f108155"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z"),},{_id:ObjectId("6241809640651f2b7f108157"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z")},{_id:ObjectId("624180ac40651f2b7f108159"),start_date:ISODate("2022-05-29T22:00:00.000Z"),end_date:ISODate("2022-06-09T22:00:00.000Z")}]}]}]

db.collection.update({"first_list.second_list.end_date":{"$exists":true}},[{"$set":{"first_list":{/** rewrite each element of first_list*/"$map":{"input":"$first_list","as":"elem1","in":{/** keep everything from elem1 and rewrite second_list*/"$mergeObjects":["$$elem1",{"second_list":{/** rewrite each element of second_list*/"$map":{"input":"$$elem1.second_list","as":"elem2","in":{/** keep all from elem2 and rewrite end_date*/"$mergeObjects":["$$elem2",{"end_date":{"$dateAdd":{"startDate":"$$elem2.end_date","unit":"hour","amount":1}}}]}}}}]}}}}}],{"multi":true})