Comment by maephisto

Lucene/Solr, Elastic Search and Algolia did a great job creating search tools and services and this extinguished the thirst of the masses. I don't think it's a solved problem, it's just a problem that has commercially viable solutions. When it comes to resources, I've found valuable knowledge in Lucene/Solr forums and mailing lists, back in the day. It's worth a read.