http://sujitpal.blogspot.com/2016/05/elasticsearch-based-ima...

Here Elasticsearch is used as a framework where "search" really means some kind of distributed feature similarity. But even text search where your incorporating a lot of data science, external signals, or semantic awareness can fall more into the category of distributed feature similarity.

Algolias strength is in a simpler path to straightforward and easily understood search. I'm not sure it's the path to amazing and deeply customized search (or search-driven features). Algolia gets far more right out of the box at a configuration level many need when they can't put a team around building an amazing Solr/ES experience.

My hope is Solr/ES can learn a thing or two in the ease of use dept with relevance!