Onsite or internal search is often a poor relation to other sexier features of a site such as the primary navigation or rich integrations with external systems such as CRM. On average 30% of users will do an onsite search, and doing so is a strong predictor of likelihood to convert (see Moz).  Onsite search is challenging though, internal search engines can never rival Google for quality and accuracy of results - because they can't rely on the many ranking factors that Google uses.  However, the Lucene search engine which forms part of the core of Umbraco does provide a…