Force ID Apps to refresh Lucene index (permgen) without a restart?

Is there any way (SOAP? REST?) to kick ID Apps to force it to go re-collect the Permgen data?

In principle, when you add/delete a role/resource, the event is supposed to flow into the UA driver, into the ID Apps and update the Lucene index.

However that seems like it may not always work.  Or maybe it is when you have a UA cluster and the permgen data is not quite replicating well.

So I figured would be useful to go order UA to go collect the pergen data again, since an outage is less than optimal.