While I was at Eventbrite we were using Solr and started moving to Elasticsearch. I know one of the main people I worked with on that recently left for Github,

While I was at Eventbrite we were using Solr and started moving to Elasticsearch. I know one of the main people I worked with on that recently left for Github, which also uses Elasticsearch. At Mozilla I work one project with a search component (https://crash-stats.mozilla.org/ https://crash-stats.mozilla.org/), and it uses Elasticsearch.