LinkedIn open sources IndexTank: search engine and service
What is the differentiation between using this and using Solr?  ElasticSearch?What does "real-time" mean in this context? Is it indexing database content in real-time? Is it in reference to the look-ahead, predictive query completion LinkedIn has?What would compel someone like me -- a dev who has ownership over the very significant search piece of my company's primary product -- to give this serious evaluation?