Asalamu Alaikum
Al Hind = Indian sub-continent (however, Pakistan was at some points in time regarded by many as part of Khorasan rather than Al Hind)
Ghazwa = Religious war (typically with Rasulullah Peace Be Upon Him, but can be used to refer to a religious war in general)
Yes, there are multiple hadees, but only one of them is not daif, and that's this one:
It was narrated that Thawbaan, the freed slave of the Messenger of Allah (blessings and peace of Allah be upon him), said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “There are two groups of my ummah whom Allah will protect from the Fire: a group who will conquer India, and a group who will be with ‘Eesaa ibn Maryam (peace be upon him).”
This hadith is in Sunan An Nisai and Al Musnad. It has been classified as sahih by Imam Al Albani.