Expected Shortfall is not elicitable as some papers have pointed out. That simply means that there is no scoring function that elicits ES.
My question is, does this imply that Expected Shortfall point forecasts are impossible to backtest?
Still, there are backtests available for ES. Second question, how is the ES forecast backtested, that is how is the value of ES used in any backtest. To what is the ES forecast compared to in a backtest.