Sanne Grinovero Actually, there are some corner cases where documents with no coordinates (assumed to be at (0,0) with the current Lucene impl) may appear in the results. When only sorting and not filtering, for instance, or when sorting and doing loose filtering around Africa (the coordinates (0,0) are very close to Africa). This would result in rather confusing results.

No, really, the current behavior feels really weird. I think it's at least worth a PR ; we can always reject it if Sanne Grinovero still has strong concerns.