Bol.com is the number one online retailer in the Netherlands, and serves more than five million customers in the Netherlands and Belgium. Oracle’s search engine Endeca has been used for many years to handle millions of requests, but with the current and planned growth, bol.com is starting to reach the limits of Endeca. In January 2016, bol.com started with the migration towards Elasticsearch as the new search engine for the webshop. Now one year later, some parts of the webshop are fully migrated to Elasticsearch, with more to be added in the near future. This talk is about the journey of migrating from Endeca to Elasticsearch and all the technical/functional challenges that come with switching from the current search engine to Elasticsearch.