the original 'aryans' conquered India around 4000 bc. There were already people there which I believe are mostly the ancestors modern day dravidians. The upper caste Indian ethnic groups probably do have distant ancestors going way back to the yamnaya.
but of course 6k years is a long time. A lot of mixing, genetic drift, and adaptation to their new environment happened. No population on earth is really much like their ancestors 6k years ago...and that includes Europeans.
the brain and the 'spirit' of the modern European was pretty much forged in the past 1000 years imo. And is a product of selective pressures from dwelling in a feudal society.