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Term and usage
In Arabic, ghazwa al-hind (غزوة الهند), but the concept is more well known in it's Urdu/Persian expression, ghazwa-e-hind, which uses the Urdu/Persian ezafe ("-e-" meaning "of"). Ghazwa means military expedition, attack or conquest  and hind means India . This is because it is very often referenced by anti-Indian polemicists living in Pakistan.
An Islamist group in Pakistan called Lashkar-e-Taiba has declared that the Ghazwa-e-Hind prophecy refers to a forthcoming war in which India will be defeated and united with Pakistan, thus bringing the Indian subcontinent under unified Islamic rule.
This one is graded hasan (good) by Islamic scholars. It promises Muslims being safe from fire, if they invade India:
It was narrated that Thawban, the freed slave of the Messenger of Allah (ﷺ), said: "The Messenger of Allah (ﷺ) said: 'There are two groups of my Ummah whom Allah will free from the Fire: The group that invades India (تَغْزُو الْهِنْدَ, taghzoo al-hind), and the group that will be with 'Isa bin Maryam, peace be upon him.'"
From the same source there are another two weak hadiths:
It was narrated that Abu Hurairah said: "The Messenger of Allah (ﷺ) promised that we would invade India (غَزْوَةَ الْهِنْدِ, ghazwa al-hind). If I live to see that I will sacrifice myself and my wealth. If I am killed, I will be one of the best of the martyrs, and if I come back, I will be Abu Hurairah Al-Muharrar."
It was narrated that Abu Hurairah said: "The Messenger of Allah (ﷺ) promised us that we would invade India (غَزْوَةَ الْهِنْدِ, ghazwa al-hind). If I live to see that, I will sacrifice myself and my wealth. If I am killed, I will be one of the best of the martyrs, and if I come back, I will be Abu Hurairah Al-Muharrar."   Al-Muharrar: The one freed (from the Fire).
- Haqqani, Husain (27 March 2015). "Prophecy & the Jihad in the Indian Subcontinent - by Husain Haqqani". Hudson Institute.
For example, Lashkar-e-Taiba has often spoken of Ghazwa-e-Hind as a means of liberating Kashmir from Indian control. The group’s founder, Hafiz Muhammad Saeed, has declared repeatedly that “[i]f freedom is not given to the Kashmiris, then we will occupy the whole of India including Kashmir. We will launch Ghazwa-e-Hind. Our homework is complete to get Kashmir.” Pakistani propagandist Zaid Hamid has also repeatedly invoked Ghazwa-e-Hind as a battle against Hindu India led from Muslim Pakistan. According to Hamid, “Allah has destined the people of Pakistan” with victory and “Allah is the aid and helper of Pakistan.”