I've met Grant Ingersoll at SIGIR in Portland, but unfortunately I had only a short chat with him. In particular I wanted to ask him about ElasticSearch, which has gained quite some prominence lately and it is quickly becoming a serious competition to Solr. Therefore I was glad that our friends at Sematext started a blog post series comparing theses two decent open source search engines built on top of Lucene.
A good Solr vs. ElasticSearch coverage is long overdue. We make good use of our own Search Analytics and pay attention to what people search for. Not surprisingly, lots of people are wondering when to choose Solr and when ElasticSearch. As the Apache Lucene 4.0 release approaches and with it Solr 4.