It’s time the Amazon.com Inc. boss took notice of his real rival in India, the only billion-strong consumer market open to Western tech firms. While Walmart Inc.’s acquisition this year of Flipkart Online Services Pvt., a homegrown e-tailer, might have given the impression that the battle for India would be an all-American contest, a new national e-commerce policy doing the rounds in New Delhi should disabuse Bezos of that notion.