I thought as much. I'm afraid what you're thinking of is the Indian Rising that took place in India circa 1856-57. Which is very much outside the scope of this mod. Don't get me wrong, I'd love to see an Indian Rising (or Mutiny) mod or even a 'conquest of India' mod - there was a game, Sword of the Raj, a long time ago that I think would do great as a Total War mod with the Moghuls, Mahrattas, Hyderabad and Scindes, Sikh's, Gurkhas and Afghans competing with the British, French and Dutch East India companies for the subcontinent. If you want to get a team together I'd support you and maybe help with research but I'm afraid that Indian or HEIC units are not going to appear in this mod.

Sincerely sorry,
Harlechman