During 5/2 Wiki HOA Paul shared Lunr indexes.
Thinking about Dr.SES and distributed smart contracts this gem caught my eye.
"For large numbers of documents, it can take time for Lunr to build an index. The time taken to build the index can lead a browser to block; making your site seem unresponsive." page 
YOUTUBE J0KmJpbEU-U The search engine was invented by Michael Egli in 2016 and it's a free open source software. Special thanks to Oliver Nightingale (lunr.js) and Wei Song (elasticlunr.js).