Ask Google who played the mens semifinals of Wimbeldon three years ago and Google will tell you it indexed 6 million pages to provide a link that may or may not have the 4 names I am looking for. Why is it doing all this pointless work? And why is it that dumb in 2018?
We have got so used to what it does that lot of people have stopped asking questions about how it does things and wether all the stuff it does is required.
Wolframalpha, Freebase/SemanticWeb/Wikidata/dbpedia approaches, NLP/NLU are still very underdeveloped and untapped.
Having open and distributed indexes like we see in nature with DNA is also totally unexplored because of Google type centralised index monopolies in various domains. It just takes a Gig or so to store a local offline index off all Wikipedia or Stackoverflow pages. And given the massive RAM and hard disks everyone has these days why aren't we seeing sophisticated local offline search apps?
The internet is getting exponentially more noisy day by day and in many ways its easier to find quality info going through a top notch library's index than wading through Google's. So there are lots of blindspots and areas to explore in search right now imho.