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[9.1] Fix default index options when dimensions are unset for legacy indices #130575

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Merged
merged 2 commits into from
Jul 4, 2025
Merged

[9.1] Fix default index options when dimensions are unset for legacy indices #130575

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20b4718
Fix default index options when dimensions are unset for legacy indice…
jimczi Jul 3, 2025
125f0d9
Merge branch '9.1' into backport_130572_9_1
jimczi Jul 4, 2025
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34 changes: 34 additions & 0 deletions rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/40_knn_search.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -605,6 +605,40 @@ setup:
- match: { hits.hits.0._score: $knn_score0 }
- match: { hits.hits.1._score: $knn_score1 }
- match: { hits.hits.2._score: $knn_score2 }

---
"Dimensions are dynamically set":
- do:
indices.create:
index: test_index
body:
mappings:
properties:
embedding:
type: dense_vector

- do:
index:
index: test_index
id: "0"
body:
embedding: [ 0.5, 111.3, -13.0, 14.8, -156.0 ]

- do:
indices.get_mapping:
index: test_index

- match: { test_index.mappings.properties.embedding.type: dense_vector }
- match: { test_index.mappings.properties.embedding.dims: 5 }

- do:
catch: bad_request
index:
index: test_index
id: "0"
body:
embedding: [ 0.5, 111.3 ]

---
"Updating dim to null is not allowed":
- requires:
Expand Down
88 changes: 31 additions & 57 deletions server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -327,7 +327,9 @@ public Builder(String name, IndexVersion indexVersionCreated) {
|| previous.updatableTo(current)
);
if (defaultInt8Hnsw || defaultBBQ8Hnsw) {
this.indexOptions.alwaysSerialize();
if (defaultBBQ8Hnsw == false || (dims != null && dims.isConfigured())) {
this.indexOptions.alwaysSerialize();
}
}
this.indexed.addValidator(v -> {
if (v) {
Expand All @@ -350,21 +352,31 @@ public Builder(String name, IndexVersion indexVersionCreated) {
}

private DenseVectorIndexOptions defaultIndexOptions(boolean defaultInt8Hnsw, boolean defaultBBQHnsw) {
if (this.dims != null && this.dims.isConfigured() && elementType.getValue() == ElementType.FLOAT && this.indexed.getValue()) {
if (defaultBBQHnsw && this.dims.getValue() >= BBQ_DIMS_DEFAULT_THRESHOLD) {
return new BBQHnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
new RescoreVector(DEFAULT_OVERSAMPLE)
);
} else if (defaultInt8Hnsw) {
return new Int8HnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
null,
null
);
}
if (elementType.getValue() != ElementType.FLOAT || indexed.getValue() == false) {
return null;
}

boolean dimIsConfigured = dims != null && dims.isConfigured();
if (defaultBBQHnsw && dimIsConfigured == false) {
// Delay selecting the default index options until dimensions are configured.
// This applies only to indices that are eligible to use BBQ as the default,
// since prior to this change, the default was selected eagerly.
return null;
}

if (defaultBBQHnsw && dimIsConfigured && dims.getValue() >= BBQ_DIMS_DEFAULT_THRESHOLD) {
return new BBQHnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
new RescoreVector(DEFAULT_OVERSAMPLE)
);
} else if (defaultInt8Hnsw) {
return new Int8HnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
null,
null
);
}
return null;
}
Expand Down Expand Up @@ -2713,47 +2725,9 @@ public void parse(DocumentParserContext context) throws IOException {
}
if (fieldType().dims == null) {
int dims = fieldType().elementType.parseDimensionCount(context);
;
final boolean defaultInt8Hnsw = indexCreatedVersion.onOrAfter(IndexVersions.DEFAULT_DENSE_VECTOR_TO_INT8_HNSW);
final boolean defaultBBQ8Hnsw = indexCreatedVersion.onOrAfter(IndexVersions.DEFAULT_DENSE_VECTOR_TO_BBQ_HNSW);
DenseVectorIndexOptions denseVectorIndexOptions = fieldType().indexOptions;
if (denseVectorIndexOptions == null && fieldType().getElementType() == ElementType.FLOAT && fieldType().isIndexed()) {
if (defaultBBQ8Hnsw && dims >= BBQ_DIMS_DEFAULT_THRESHOLD) {
denseVectorIndexOptions = new BBQHnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
new RescoreVector(DEFAULT_OVERSAMPLE)
);
} else if (defaultInt8Hnsw) {
denseVectorIndexOptions = new Int8HnswIndexOptions(
Lucene99HnswVectorsFormat.DEFAULT_MAX_CONN,
Lucene99HnswVectorsFormat.DEFAULT_BEAM_WIDTH,
null,
null
);
}
}
if (denseVectorIndexOptions != null) {
denseVectorIndexOptions.validateDimension(dims);
}
DenseVectorFieldType updatedDenseVectorFieldType = new DenseVectorFieldType(
fieldType().name(),
indexCreatedVersion,
fieldType().elementType,
dims,
fieldType().indexed,
fieldType().similarity,
denseVectorIndexOptions,
fieldType().meta(),
fieldType().isSyntheticSource
);
Mapper update = new DenseVectorFieldMapper(
leafName(),
updatedDenseVectorFieldType,
builderParams,
denseVectorIndexOptions,
indexCreatedVersion
);
DenseVectorFieldMapper.Builder builder = (Builder) getMergeBuilder();
builder.dimensions(dims);
Mapper update = builder.build(context.createDynamicMapperBuilderContext());
context.addDynamicMapper(update);
return;
}
Expand Down