Prevent filtering documents on rootPath

[indykoning]

A bit of backstory:

I've used Vue instantsearch to create product pages with category filters, but these categories might not all get indexed due to a "Hide from filters" option which makes sure that category is not added to the index used for filtering.

We manage the currently filtered products using a category_ids where we use a hierarchicalList with category_lvlx to add filtering for subcategories.

When no categories are hidden from the filters it's fine. However when we hide e.g. "men / tops" and navigate to that page we still get a query looking like:

{
    ...
    "filter": [
        {
            "bool": {
                "should": [
                    {
                        "term": {
                            "category_lvl2.keyword": "Men > Tops"
                        }
                    }
                ]
            }
        },
        {
            "query_string": {
                "query": "category_ids:12"
            }
        }
    ],
}

But Men > Tops and any level deeper for that category does not actually exist on category_lvlx so we get no results, even though it is in category_ids

I'm looking for a way to remove

        {
            "bool": {
                "should": [
                    {
                        "term": {
                            "category_lvl2.keyword": "Men > Tops"
                        }
                    }
                ]
            }
        }

from the query when it's the root path, and use the root pathe solely for filtering the filter itself.
Only adding it to the query once it deviates from the root path.