Vinted moves from Elasticsearch to Vespa

Vinted, Europe's largest online marketplace for second-hand fashion, reported significant improvements in their search functionality after migrating from Elasticsearch to Vespa. The transition resulted in halving the number of servers to 60, enhancing search and indexing latency by 2.5x and 3x respectively, and reducing the visibility time for changes from 300 seconds to just 5 seconds. The migration also resulted in stable search traffic, deterministic query loads, and equitable load distribution across nodes, eliminating the issue of "hot nodes." Additionally, Vinted increased its ranking depth by over three times, up to 200,000 items, leading to more relevant search results and reduced maintenance efforts due to simpler management of Vespa's infrastructure compared to Elasticsearch.