The S&P 500 and the Nasdaq indexes opened at record highs on Monday, led by gains in Tesla and energy stocks at the start of a week packed with economic data as well as the Federal Reserve’s potential move to slow down bond purchases. The Dow Jones Industrial Average rose 14.09 points, or 0.04 percent, at the open to 35,833.65. The S&P 500 opened higher by 5.24 points, or 0.11 percent, at 4,610.62, while the Nasdaq Composite gained 42.87 points, or 0.28 percent, to 15,541.26 at the opening bell.