Purests would argue it isn’t minestrone at all. Let’s say it is in the style of a good minestrone, and it opens you up to make it with whatever you have and whatever you feel like.
This recipe calls for Sambal Oelek. If you don’t have it, but you have sriracha or chili-garlic sauce, then you are in business. (For a good run down on how each of those three sauces differ, see this.)