How to configure a text index with stop words but no stemming

Hi,

How can I configure a text index that disables stemming but uses stop words? The docs state that setting language to 'none' will prevent both stemming and stop words, but I only want to prevent stemming. This post explains how to set the default_language to 'none' on the index, but this is NOT what I want, because it disables both stop words and stemming.

Thanks!