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Fix knn search error when dimensions are not set #131081

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Merged
merged 5 commits into from
Jul 11, 2025
Merged

Fix knn search error when dimensions are not set #131081

merged 5 commits into from
Jul 11, 2025

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carlosdelest
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A KNN search that uses similarity when no dimensions are set for a dense_vector field caused a NPE when calculating similarity:

            if (similarityThreshold != null) {
                knnQuery = new VectorSimilarityQuery(
                    knnQuery,
                    similarityThreshold,
                    similarity.score(similarityThreshold, elementType, dims)
                );
            }

Having no dimensions set on a dense_vector field means that no data has been ingested yet, so we can shortcut to use a MatchNoDocsQuery in this case.

Closes #129550

@carlosdelest carlosdelest added >bug auto-backport Automatically create backport pull requests when merged :Search Relevance/Vectors Vector search v8.9.1 v8.9.2 Team:Search Relevance Meta label for the Search Relevance team in Elasticsearch v8.19.0 v8.18.5 labels Jul 11, 2025
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Hi @carlosdelest, I've created a changelog YAML for you.

@carlosdelest carlosdelest mentioned this pull request Jul 11, 2025
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@carlosdelest carlosdelest marked this pull request as ready for review July 11, 2025 13:25
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Pinging @elastic/es-search-relevance (Team:Search Relevance)

@carlosdelest carlosdelest requested a review from a team July 11, 2025 14:05
john-wagster
john-wagster approved these changes Jul 11, 2025
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lgtm

@carlosdelest carlosdelest merged commit bbc4cef into elastic:main Jul 11, 2025
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💔 Backport failed

Status Branch Result
❌ 8.9 Commit could not be cherrypicked due to conflicts
❌ 8.19 Commit could not be cherrypicked due to conflicts
❌ 8.18 Commit could not be cherrypicked due to conflicts

You can use sqren/backport to manually backport by running backport --upstream elastic/elasticsearch --pr 131081

@carlosdelest carlosdelest mentioned this pull request Jul 11, 2025
Merged
carlosdelest added a commit to carlosdelest/elasticsearch that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (elastic#131081)
ea957b8 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
@carlosdelest carlosdelest mentioned this pull request Jul 11, 2025
Merged
carlosdelest added a commit to carlosdelest/elasticsearch that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (elastic#131081)
cc45de8 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	server/src/main/java/org/elasticsearch/search/SearchFeatures.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
@carlosdelest carlosdelest mentioned this pull request Jul 11, 2025
Merged
carlosdelest added a commit to carlosdelest/elasticsearch that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (elastic#131081)
0e75627 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	server/src/main/java/org/elasticsearch/search/SearchFeatures.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
@carlosdelest carlosdelest mentioned this pull request Jul 11, 2025
Merged
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💚 All backports created successfully

Status Branch Result
✅ 9.1
✅ 9.0
✅ 8.19
✅ 8.18

Questions ?

Please refer to the Backport tool documentation

carlosdelest added a commit to carlosdelest/elasticsearch that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (elastic#131081)
648b3b8 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	server/src/main/java/org/elasticsearch/search/SearchFeatures.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
carlosdelest added a commit that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (#131081) (#131122)
c3b3793
carlosdelest added a commit that referenced this pull request Jul 11, 2025
@carlosdelest
Fix knn search error when dimensions are not set (#131081) (#131119)
b5b77da
elasticsearchmachine pushed a commit that referenced this pull request Jul 14, 2025
@carlosdelest
Fix knn search error when dimensions are not set (#131081) (#131118)
c53d73d 
* Unmute tests muted in #129550 as they were fixed in #127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
elasticsearchmachine pushed a commit that referenced this pull request Jul 14, 2025
@carlosdelest
Fix knn search error when dimensions are not set (#131081) (#131120)
df80e2e 
* Unmute tests muted in #129550 as they were fixed in #127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml

(cherry picked from commit bbc4cef)

# Conflicts:
#	server/src/main/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapper.java
#	server/src/main/java/org/elasticsearch/search/SearchFeatures.java
#	x-pack/plugin/esql/qa/testFixtures/src/main/resources/knn-function.csv-spec
mridula-s109 pushed a commit to mridula-s109/elasticsearch that referenced this pull request Jul 17, 2025
@carlosdelest @mridula-s109
Fix knn search error when dimensions are not set (elastic#131081)
20e0d2b 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml
mridula-s109 pushed a commit to mridula-s109/elasticsearch that referenced this pull request Jul 17, 2025
@carlosdelest @mridula-s109
Fix knn search error when dimensions are not set (elastic#131081)
2cad879 
* Unmute tests muted in elastic#129550 as they were fixed in elastic#127322

* Return no match when no dimensions have been set

* Add tests

* Update docs/changelog/131081.yaml
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@benwtrent benwtrent benwtrent approved these changes

@john-wagster john-wagster john-wagster approved these changes

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ESQL: partial failure in few KNN tests
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@carlosdelest @elasticsearchmachine @benwtrent @john-wagster