Unfortunately I could not find anything up-to-date online about this topic. Similar to the question stated here: OS X Yosemite Spotlight extensions, is it possible by now to extend Spotlight on macOS Sierra?
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Yes it is. Github user w0lfSchild is still actively maintaining this project: https://github.com/w0lfschild/Flashlight, which also allows writing your own plugins. It is actually a fork of the Flashlight project mentioned in the post you linked to

Tim Nederveen
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…but note that it's got some major unresolved bugs right now, e.g. https://github.com/w0lfschild/Flashlight/issues/17 – Feb 14 '17 at 00:49