Site Indexer and Global Search

I've installed "Site Indexer" and "Global Site Search" on my multisite. They seem to be working great except for 1 minor inconvenience. I realize "Site Indexer" was designed to only index new posts but I have just over 3000 previously published posts between all sites. Is there any way to get all these indexed into the global search function? I've found that manually updating the "published date" to a date after "Site Indexer" was installed will get it indexed but I just don't have that much time to kill.

Thanks,
Larry Bartley