Why it matters

OpenSearch is AWS-friendly ES fork. Understanding shapes options.

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The architecture

KNN plugin + vector types.

HNSW + IVF indexes.

Hybrid: BM25 + KNN.

AWS-managed OpenSearch Service.

OpenSearch vector stackKNN pluginvector searchHNSW + IVFindex optionsHybrid + AWSmanaged serviceAWS OpenSearch Service; Apache 2 license vs Elastic license changes
OpenSearch vector.
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How it works end to end

AWS OpenSearch Service managed.

Apache 2 licensed.

Similar to Elasticsearch feature set.