Thirty tribes living in the Arunachal Padesh with the Apatani, and the legends of tribal raids are not a thing of antiquity. As late as the 1940s, some degree of slavery still existed in the Apatani tribe and the surrounding tribes. One photo of a captured tribesman taken during the 1940s shows him with a large log on his foot to prevent him from escaping.
The British, who controlled India for much of their modern history, had outlawed slavery but made only minor changes to the Indian slavery systems they found in place. Slavery, whether by contract or otherwise, was beneficial to the East India Trading Company, and parliament tended to turn a blind eye.
In Apatani culture, people could be born into slavery, purchased or captured in battle.