Bob, I actually looked for documentation on this earlier today before I posted my response, and I was surprised to find that there wasn’t any docs for it — so unfortunately no I don’t have anything to point you to at the moment, but I have alerted our docs team.
However, prior to Spark 12.2.14 there was a bug where this action was not executing at all. Which Skuid release are you on? That might be what the issue is.