Summary
This post explores Tinder's migration from Elasticsearch 6 to Elasticsearch 8, detailing the behind-the-scenes challenges and strategies employed to modernize their infrastructure. Key updates include improved recommendation algorithms utilizing custom plugins, operational efficiency gains, and advanced capabilities enabled by the latest Elasticsearch features such as k-nearest neighbor searches and real-time profile recommendations. The migration process is meticulously outlined, focusing on overcoming technical debt, ensuring performance, and achieving a scalable Elasticsearch platform for Tinder without outages or major pitfalls.