Amazon OpenSearch Serverless introduced support for Zstandard (zstd) codecs, allowing customers to compress indexes and reduce storage costs by up to 32% compared to the default LZ4 codec. Customers can select compression levels to balance storage efficiency with indexing throughput and query latency.
Two zstd modes are available—standard and no dictionary—providing flexibility for diverse workloads like log analytics and time-series data. This feature is available globally across supported AWS regions, configured during index creation for better cost-performance optimization.
Source & further reading
Amazon OpenSearch Serverless now supports Zstandard (zstd) codec for index compression ↗Source published 2026-04-09. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.