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Recently I stumbled upon IndexDen which is a commercial sphinx hoster and has a free plan for 15k documents. My first idea was to tweak your plugin in order to use IndexDen, so that smaller boards being on hosted services with no possibility to set a sphinx server of their own, could benefit from your work, too.
Looking at your plugin has impressed me: your work is far more complex than I expected! (I haven't used it by now)
So before I even started to dive into your code, I thought I'll simply ask you, @mcu_hq: do you think tweaking your plugin to use something like IndexDen as the search backend would be just a tweaking or would it be a major rewrite of what you've done?