spent his "lost years" and his life after the crucifixion in the Indian subcontinent

This paper explores the thesis of Holger Kersten’s 1983 work, Jesus Lived in India , which posits that Jesus of Nazareth

as evidence that Jesus was still alive when he was taken down from the cross. Life and Death in Kashmir:

Linguists argue that the Sanskrit name "Isa" (īśa) simply means "Lord" or "Master" and is an attribute of Shiva. They argue that the verses in the Bhavishya Purana cited by Kersten are likely later interpolations (additions) made during the Mughal era or the colonial period, rather than contemporary accounts.