[DOC] Deprecate confidence_interval parameter in Lucene Scalar Quantizer #12100
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The confidence_interval parameter in the Lucene SQ encoder is deprecated as of OpenSearch 3.6.0 and will be removed in a future release.
confidence_interval was originally passed to Lucene99ScalarQuantizedVectorsFormat, but Lucene dropped support for it in Lucene104HnswScalarQuantizedVectorsFormat — the confidence interval is now computed automatically from vector dimensionality. The KNN1040 codec currently preserves the parameter via the backward-compatible Lucene99RWHnswScalarQuantizedVectorsFormat, but it will have no effect in future codec versions.
Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
3.6
What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/k-NN#3168