Spinach and Pancetta Hand Pies

Name: Spinach and Pancetta Hand Pies
Ingredients: For the crust:; 2 1/2 cups all-purpose flour; 1 teaspoon Kosher salt; 1 cup gruyere cheese, shredded; 1 cup (2 sticks) unsalted butter, cut into 1/2-inch pieces; 1/2 cup ice water; For the filling and assembling the hand pie;; 6 ounces pancetta, chopped into 1/4 - 1/2 inch cubes; 2 leeks, white and light-green parts only, halved lengthwise, then thinly sliced; 6 ounces baby spinach; 1 tablespoon fresh sage, chopped; 2 tablespoons all-purpose flour; 1 cup chicken broth; Kosher salt and freshly ground black pepper to taste; 1 egg whisked