I want to get the available options/items of a layered navigation, but I cannot find out how to achieve this.
Basically, I want to know what filters with items are available, when I set some filters, without having a product collection. For example: I send an request saying size L categories Tshirts and get returned the colors red and blue are availble, but not the color black.
I just cannot find, where the options of my attributes are being filtered.
I hope I could make myself clear.