We can update https://www.mongodb.com/docs/atlas/device-sdks/sdk/dotnet/model-data/change-an-object-model/#migration-functions - instead of using `.ElementAt(i)`, we could replace the for loop with:
foreach (var oldPerson in migration.OldRealm.DynamicApi.All("Person"))
{
var newPerson = migration.FindInNewRealm<Person>(oldPerson);
}