India's largest business group, Reliance Industries , has been battling geopolitical headwinds in its oil refining and, reportedly, in one of its new energy ventures. But those are not the oil-to-telecom conglomerate's biggest worries. The slowdown in its retail business, the group's third largest vertical, has had analysts reduce earnings estimates and cut stock target price, even as they maintain a buy rating on Reliance shares. Reliance Retail's revenue grew just 8.1% on year and its