It is very frustrating how "nobody has ever done comprehensive and non-biased benchmarks". All the comparisons I have seen are based on stories and anecdotes. Well, they are both very performant, I know. But, if somebody is going to publish a comparison why don't they qualify this?
PS: I find it kind of an oxymoron that the article under discussion criticizes Solr for using Zookeeper in one paragraph; "ZooKeeper is super mature, super widely used, etc. etc., but it’s still another moving part.", then on the next paragraphs it cites that one of the most dreadful thing about ES is the lack of a proven master election algorithm; "While Elasticsearch has built-in ZooKeeper-like component called Xen, ZooKeeper is better at preventing the dreaded split-brain problem sometimes seen in Elasticsearch clusters."
PS: I find it kind of an oxymoron that the article under discussion criticizes Solr for using Zookeeper in one paragraph; "ZooKeeper is super mature, super widely used, etc. etc., but it’s still another moving part.", then on the next paragraphs it cites that one of the most dreadful thing about ES is the lack of a proven master election algorithm; "While Elasticsearch has built-in ZooKeeper-like component called Xen, ZooKeeper is better at preventing the dreaded split-brain problem sometimes seen in Elasticsearch clusters."