Can MMR be applied only to the semantic part of a hybrid query?

[pablo]

@rajanimaski I’m just adding this for traceability.

Why MMR is not supported in hybrid queries

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): 3.3 Describe the issue: Why MMR is not supported in hybrid queries It is due to limitations in hybrid search executor and significant performance risks. The current hybrid queries executor runs independently and: Merges lexical and vector signals early in execution. Leaves no clear stage to apply MMR on a clean, semantic-only candidate set. MMR must be applied to semantic search results before any score fusion. Althoug…