So, let's say you've got a product catalog in some SQL database. Your business processes update inventory and availability and leadtime and such in that database.

But you really like the lucene natural language search functionality, so you copy your database into a lucene database for searching. But hey, elasticsearch takes care of a bunch of tedious problems, so instead of using raw lucene, you use elasticsearch...

So, you've got a PHP web application that queries this cache of the catalog stored in elasticsearch; what's your legal liability?