Indian benchmark indices, Sensex and Nifty 50, are expected to open flat on November 28, following GIFT Nifty's performance. After a volatile session, the Sensex rose by 230.02 points (0.29%) to close at 80,234.08, while the Nifty increased by 82.20 points (0.34%) to settle at 24,276.7, with notable gains in Adani Group stocks.