A high performing search service implies both having an effective search infrastructure and high search relevance. Seeking for a fault tolerant, self-healing and cost-effective search infrastructure at scale, we built a platform based on Apache Solr search engine with light in-memory indexes, avoiding sharding and decreasing the overall infrastructure needs. To populate the indexes, we use flexible ETL processes, keeping our product catalog and search indexes updated in a near real-time fashion and distributed across high-performant database engines. We aim at getting a high search relevance precision and recall by applying query relaxation and boost solutions on top of the optimised platform. https://www.activate-conf.com/speakers/detail/roger-rafanell