2012
Apache Solr vs ElasticSearch - the Feature Smackdown!
A Solr vs ElasticSearch comparison
2010
ElasticSearch - Open Source, Distributed, RESTful Search Engine
A distributed, highly available and restful search engine. It looks very promising and rather easy to deploy and have working. The killer feature : schema-less indexing (auto-discovery based on conventions). A serious concurrent to Solr ?
1
(2 marks)