Performance of OpenSearch K-NN Search with Additional Filters (e.g., Metadata Conditions)

Plugins k-NN
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I came across this AWS blog on OpenSearch K-NN — very helpful!

I’m exploring K-NN queries with filters (e.g., status = 'active') and wondering about performance implications.

In pgvector, there’s an “iterative index scan” explained in detail in this blog that optimizes K-NN with filters.

Does OpenSearch offer a similar optimization or guidance for such queries?
Any benchmarks or best practices would be great.

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