From my own perspective and not that of a book index, full titles in alphabetical order suits best.In which case I doff my cap to the all-knowing genius of Bill Gates and his team. (But it might still be wrong.)
Yes, that leads to lots of things called 'The...', but for visitors searching, wiki and general housekeeping - unaltered, full titles would have suited.
Possibly as I don't deal with things like: 'Edges Are No Longer Parallel, The'
It is what it is however - so not to worry.