XenForo Enhanced Search (XFES) is an add-on that replaces XenForo's built-in search to provide high performance search capabilities to larger boards and to give users more flexible search options. XFES is built on top of
elasticsearch. This gives excellent performance, even with millions of pieces of content. Elasticsearch allows nearly infinite scalability and redundancy by silently allowing searches to be run across multiple servers. Additionally, users benefit from a very small stopword list and no minimum word length, allowing nearly any search to return meaningful results.
XFES also provides support for returning results based on how relevant they are to a particular search query. Users can select relevancy ordering on the advanced search page. XFES also allows to select a "stemming analyzer", which means that words are reduced to their roots before searches are performed. For example, a search for "tests", will automatically return results for "test", "tested", "testing", and similar words. (This is only accurate for English boards currently.)