OpenSearch Vector Engine can now run vector search at a third of the cost on OpenSearch 2.17+ domains. You can now configure k-NN (vector) indexes to run on disk mode, optimizing it for memory-constrained environments, and enable…
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https://aws.amazon.com/blogs/big-data/opensearch-vector-engine-is-now-disk-optimized-for-low-cost-accurate-vector-search/