I'm seeing the same thing in my library too, and I have only requested that EYB index a small handful of my unindexed titles. I guess it's possible that someone with a very large library has been hitting "Request Index" on every single one of their unindexed titles or a large group of people, but maybe it's a bug. When I sorted my unindexed titles by Popularity it does seem like most of the really obscure titles in my library still say "Request Index".