[8.19] New vector_rescore parameter as a quantized index type option (#124581)
#127644
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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
commented
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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mainto8.19:vector_rescoreparameter as a quantized index type option (#124581)Related: #127647
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