I dont know much but it seems like this event will happen right before Hazrat Isa (AS) comes back.
QUOTE
Na’im, son of Hammad in al-Fitan reports that, Abu Huraira said that the Messenger of Allah (blessings and peace be upon him) mentioned India and said, “A group of you will conquer India, Allah will open for them (India) until they come with its kings chained – Allah having forgiven their sins – when they return back (from India), they will find Esa son of Maryam in Syria.”
- Kitab Al Fitan
Allah knows best.