[{"_id":ObjectId("57315ba4846dd82425ca2408"),"myarray":[{userId:"8bc32153-2bea-4dd5-8487-3b65e3aa0869",Time:ISODate("2022-09-20T04:44:46.000+00:00"),point:5},{userId:"5020db46-3b99-4c2d-8637-921d6abe8b26",Time:ISODate("2022-09-20T04:44:49.000+00:00"),point:2},{userId:"5020db46-3b99-4c2d-8637-921d6abe8b26",Time:ISODate("2022-09-20T04:44:49.000+00:00"),point:2},{userId:"5020db46-3b99-4c2d-8637-921d6abe8b26",Time:ISODate("2022-09-20T04:44:49.000+00:00"),point:2},]}]

db.collection.update({},[{$set:{myarray:{$cond:[{$in:["12345","$myarray.userId"]},{$map:{input:"$myarray",in:{$cond:[{$eq:["$$this.userId","12345"]},{$mergeObjects:["$$this",{Time:"$$NOW",point:5}]},"$$this"]}}},{$concatArrays:["$myarray",[{userId:"12345",point:6,Time:"$$NOW"}]]}]}}},{$set:{myarray:{$cond:[{$gt:[{$size:"$myarray"},5]},{$filter:{input:"$myarray",cond:{$ne:["$$this.Time",{$min:"$myarray.Time"}]}}},"$myarray"]}}}])