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For old indices (< 2.19), memory optimized search is not supported. #11173

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Oct 2, 2025
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For old indices (< 2.19), memory optimized search is not supported. #11173

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For old indices (< 2.18), memory optimized search is not supported.
0ctopus13prime Oct 2, 2025
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kolchfa-aws Oct 2, 2025
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8 changes: 5 additions & 3 deletions _vector-search/optimizing-storage/memory-optimized-search.md
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Expand Up @@ -17,9 +17,11 @@ Memory-optimized search affects only search operations. Indexing behavior remain
## Limitations

The following limitations apply to memory-optimized search in OpenSearch:
- Supported only for the [Faiss engine]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#faiss-engine) with the [HNSW method]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#hnsw-parameters-1)
- Does not support [IVF]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#ivf-parameters) or [product quantization (PQ)]({{site.url}}{{site.baseurl}}/vector-search/optimizing-storage/faiss-product-quantization)
- Requires an index restart to enable or disable

- **For indexes created before OpenSearch 2.19, the engine loads data into memory regardless of whether memory-optimized mode is enabled**.
- Memory-optimized search is supported only for the [Faiss engine]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#faiss-engine) with the [HNSW method]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#hnsw-parameters-1).
- Memory-optimized search does not support [IVF]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/knn-methods-engines/#ivf-parameters) or [product quantization (PQ)]({{site.url}}{{site.baseurl}}/vector-search/optimizing-storage/faiss-product-quantization).
- An index restart is required to enable or disable memory-optimized search.

If you use IVF or PQ, the engine loads data into memory regardless of whether memory-optimized mode is enabled.
{: .important }
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