Get parametric list from IDOL API

How do I get a list of values of a parametric field in IDOL using one of the HTTP commands?

Details:

Scenario is that I have 100M records in IDOL with a parametric field called APPLICATIONNAME.  I use a customized version of the  Find UI.

Within FindUI you can select the parametric field as a filter and view all of the field values in the "Select parametric filters".  How is this specific query done?  I can't find an obvious action in the IDOL documentation.  The QUERY action doesn't seem to have this ability.

Below is an example of how the FIND UI list all the unique values:

parametric_fields.png