If you are researching the actual history (the Third Servile War, 73–71 BC), the "index" refers to the key players who shaped the Roman Republic's greatest internal crisis.
Before you click on that raw directory listing, ask yourself: Am I here for history, entertainment, or convenience? If it’s the latter, consider supporting the creators who brought the Thracian’s story to life. After all, without them, there would be no index to search. index of spartacus