Everyone is clamouring for enterprise search to work "just like Google" but success is only possible with good content and quality metadata. Findability comes from using the right business terminology and language. But organizations need to consider the variability of terms that comes from different departments and business units. Finance may refer to documents using different terms than legal might. Take a look at The Dirty Secret of Enterprise Search: It's All About Good Content by Jed Cawthorne to learn more about enterprise search.
With the growth of enterprise information, this is simply beyond human scale. AI-powered auto-classification can identify terms, extract entities and improve metadata on a tireless, ongoing basis.