It stays the same color when ripe. It's about the same size as a pear. Grows in sub tropical climate of Meghalaya, India.
I think this looks a lot like a pale variety of Solanum Muricatum or Pepino dulce/melon/pear.
It's native to South America, but I think that it would be able to be cultivated in India as well.
It looks like Tinda (Praecitrullus fistulosus), also known as round melon, Indian round gourd, Indian baby pumpkin, apple gourd, or Indian squash.
I am not fully sure but in my opinion the leaves look more like chili pepper leaves and it resembles a tomato or eggplant in the fruit, with a similar stem. It's likely a member in the nightshade family (also known as Solanaceae) https://en.wikipedia.org/wiki/Solanaceae .
For reference, a green eggplant:
However, I am unsure what the specific species might be as the leaves don't match the typical eggplant pattern.