If Similar Threads is the only thing you're interested in and you don't care for the Enhanced Search addon itself, you can consider just paying $35/year for access to Andy's collection of addons - https://xenforo.com/community/resources/similar-threads.5624/
His collection includes a Similar Threads addon.
Thanks, but your response reminds me that, since I assume this forum uses XFES, I don't really have any knowledge or experience as to what the search "enhancements" actually are other than Similar Threads, never having used regular search. Maybe someone could give opinion on that.
$55 for XFES vs. $35 is not a big deal, especially since my intended service provider likely won't service problems with third party add-ons.
Just want to second this. I had to upgrade my VPS to support it because it kept crashing, so if you're dedicated or at least have a minimum of 4 cores and 8 GB RAM you'll be okay. They don't really disclose this when buying XFES so it's up to you to understand the requirements and installation around Elasticsearch.Make sure you check the requirements for installing ElasticSearch - it uses Java and requires a lot of dedicated resources (particularly RAM).
For any site of decent size, I would strongly recommend installing XFES - it greatly reduces load on your database server, is far more efficient and gives much more accurate search results than the built-in MySQL search.
XFES also allows you to use more complex search terms - such as exact matches and required terms.
The short keyword search is critical for me - my main site uses a LOT of three-letter-acronyms.
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