Databases are optimized for durable storage: transactions, constraints, consistency, recovery. Amazon OpenSearch Service is optimized for a different job: language-aware search (matching, synonyms, typo tolerance, relevance ranking), deep vector capabilities for hybrid search that combines lexical matching with semantic similarity, and sub-second analytics at scale. Both store data reliably. But each excels at what the other merely tolerates. If your application needs both great transactional wr...