Semantic text highlighting not returned for flat quantization options #131443
Description
Elasticsearch Version
Serverless
Installed Plugins
No response
Java Version
bundled
OS Version
Serverless
Problem Description
When performing semantic highlighting on a semantic_text field with flat, int4_flat or int8_flat quantization, the semantic highlighter does not return results. Highlighting is returned with default or specified HNSW quantization.
Steps to Reproduce
DELETE test-index PUT test-index { "mappings": { "properties": { "body_content_e5": { "type": "semantic_text", "inference_id": ".multilingual-e5-small-elasticsearch", "index_options": { "dense_vector": { "type": "int4_hnsw", "confidence_interval": 0 } } } } } } PUT test-index/_doc/1 { "body_content_e5": "Elasticsearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." } get test-index/_search { "highlight": { "fields": { "body_content_e5": { "number_of_fragments": 1, "order": "score", "type": "semantic" } } }, "fields": [ "_inference_fields" ], "retriever": { "standard": { "query": { "semantic": { "field": "body_content_e5", "query": "What is Elasticsearch?" } } } } } Logs (if relevant)
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