Egyptian Spinach Pie with Hazelnut Dukkah Crust

Name: Egyptian Spinach Pie with Hazelnut Dukkah Crust
Ingredients: 1/4 cup raw hazelnuts; 1 tablespoon coriander seeds; 2 teaspoons cumin seeds; 2 tablespoons sesame seeds; 4 tablespoons unsalted butter; 4 medium shallots, finely diced; 4 cloves garlic, minced; 4 pounds fresh spinach (not baby), stemmed and sliced; 1/4 cup minced fresh dill; Pinch of freshly grated nutmeg; Kosher salt and freshly ground pepper; 8 ounces mozzarella cheese, freshly grated; 8 ounces cheddar cheese, freshly grated; 1 17-ounce package frozen puff pastry (2 sheets), thawed; 1 large egg, beaten with 1 tablespoon water; 1 tablespoon sumac