[8.19] New vector_rescore parameter as a quantized index type option (#124581)#127644
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benwtrent merged 3 commits intoelastic:8.19from May 2, 2025
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[8.19] New vector_rescore parameter as a quantized index type option (#124581)#127644benwtrent merged 3 commits intoelastic:8.19from
vector_rescore parameter as a quantized index type option (#124581)#127644benwtrent merged 3 commits intoelastic:8.19from
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…tic#124581) This adds a new parameter to the quantized index mapping that allows default oversampling and rescoring to occur. This doesn't adjust any of the defaults. It allows it to be configured. When the user provides `rescore_vector: {oversample: <number>}` in the query it will overwrite it. For example, here is how to use it with bbq: ``` PUT rescored_bbq { "mappings": { "properties": { "vector": { "type": "dense_vector", "index_options": { "type": "bbq_hnsw", "rescore_vector": {"oversample": 3.0} } } } } } ``` Then, when querying, it will auto oversample the `k` by `3x` and rerank with the raw vectors. ``` POST _search { "knn": { "query_vector": [...], "field": "vector" } } ``` (cherry picked from commit b2c1c4e)
benwtrent
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May 2, 2025
server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
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Mikep86
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May 2, 2025
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This will backport the following commits from
mainto8.19:vector_rescoreparameter as a quantized index type option (#124581)Related: #127647
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