Here's a weird thought, if you let the Indians alone they might try to declare on you later, sounds like a bad thing but if they declare your people get a happiness bonus.
Well your psychic powers are in effect here.
The Indians signed a MPP with Portugal one or two turns before Portugal was wiped out in 1375 (several days ago) and were forced to declare war on us. So I have been at war with them for a while and enjoying the war happiness.
Arabs were wiped out in 1370. My MPs were busy for several turns quelling 90+ resisters.
It is now 1410 and the Indians have lost three of their six core cities. I also autorazed one they put on the continent. They landed a settler/musket right next to two of my infantry on the other island landmass, and of course I converted him to slave workers asap. Not a good plan for him methinks. I am not pleased with their settlers leaving the island so I have no choice but to put them in the tundra.
I have two 3-cav armies on India's landmass now and a bunch of other infantry and cavs. In general they are not attacking infantry with their longbows or war elephants. So far they are not smart enough to land a war elephant in an unoccupied area, then invade and take my undefended cities. I have tried a cav as bait but not many takers.
I am teetering at single digit tiles to domination and have been busy moving cities to grassland from less desirable places. I am almost done with that. Also the workers all need assignments. Of course I ran out of money to cash rush all the upgrades for 200+ cities, so in 1400 I converted a bunch of citizens to engineers. I also disbanded at least half the armies and 3/4 of the artillery. Builds are mostly aqueducts, markets and hospitals. At 0% science, 20% lux I am making +1200 or so gold per turn IIRC.
1400 AD is turn 270 so I am over halfway there. In 20-30 turns I expect most of the tile improvements to be done so after that it will go a lot faster.