In our previous development update, we talked about our "big board search" system. We are now ready to release XenForo Enhanced Search, designed to give significantly better search performance and additional search options to your users.
First and foremost, it is built on top of elasticsearch, which is in turn built on top of Lucene. 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, you benefit from a very small stopword list and no minimum word length, allowing nearly any search to return meaningful results.
Elasticsearch also provides support for returning results based on how relevant they are to your search. You can select relevancy ordering on the advanced search page.
XenForo Enhanced Search has been running on XenForo.com for an extended period of time, so you've probably used it already.
XenForo Enhanced Search will be made available for purchase next week (the week of January 16th). It will cost $50, with an update-and-support renewal cost of $10. Add-on renewal costs are linked to your XenForo license renewal, meaning that all purchased add-ons will be renewed with your license. (For clarity, this means that with XenForo Enhanced Search, your license renewal would currently be $40 + $10.)