After several years of working with Elasticsearch and consulting many clients world-wide, it's time to share some trade secrets and lessons learned. Elasticsearch is an open-source search engine server, which is easily scalable and being used by too many companies to mention for search and real-time analytics and log processing. Come to learn about how Elasticsearch is used, what are the absolute no-no's and what are actually quite nice and innovative usages of it. I will also share useful pro-tips and a handful of takeaways you could apply to your existing (or future!) deployments of Elasticsearch.