Due to the implementation of VirtueMart on really big e-shops and experience with Elastic search, I am very worried that the implementation of Smart Search will be just another unfinished project that will not be used on really business sites.
I would be pleasantly surprised, if there was already a link to another DB for content indexing, then it might make a little sense.
Until then, it is useless to deal with this project, I would rather use Elastic Search.