What is the plural of the word “index”? asked Sep 16 '10 [on this site].
Indexes or Indices? asked Jun 16 '09, migrated from stackoverflow.com 3 hours ago.
Clearly these are duplicates of each other, but which should be closed as duplicate?
I vote for closing the migrated one. It might have been asked many years ago on StackOverflow, but it's new here.
Edit: I see that the "native" question has been merged into the migrated one. I think this was a bad decision: the migrated question has a lot more votes, but its answers aren't really correct. It also has a bunch of "me too" answers that aren't adding any value. As I've commented, I don't think such a highly-voted question should have been migrated in the first place, because there's very little we can do to correct its problems.