Is it possible to dynamically reference Collection indexes based on variables input to a UDF?

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This one is more for vanity as I am well aware of the plan to suspend service by May 30.

Before support ends, is it possible in FQL v10 do dynamically reference one of a set of Collection indexes based on an input variable.

My efforts to work out how to call an index dynamically within a UDF have failed when attempting to follow the format called out in this dynamic collection referencing example:

Using the included reference, I am attempting something like:

function getPriceLowtoHigh(index) {
  // Uses `Index()` to dynamically specify
  // the index name.
  Products.Index(index) {
    price,
    name,
    description
  }
}

I write the above knowing that Index() is not a valid FQL in-built function though want to find something similar.

I understand that it may not be as simple to just reference an index rather than a collection though appreciate if someone could tell me it is not possible so I can rest easy.