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https://github.com/milvus-io/milvus/issues/42589 <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Semantic Highlighting Feature **Core Invariant**: Semantic highlighting operates on a per-field basis with independent text processing through an external Zilliz highlight provider. The implementation maintains field ID to field name mapping and correlates highlight results back to original field outputs. **What is Added**: This PR introduces semantic highlighting capability for search results alongside the existing lexical highlighting. The feature consists of: - New `SemanticHighlight` orchestrator that validates queries/input fields against collection schema, instantiates a Zilliz-based provider, and batches text processing across multiple queries - New `SemanticHighlighter` proxy wrapper implementing the `Highlighter` interface for search pipeline integration - New `semanticHighlightOperator` that processes search results by delegating per-field text processing to the provider and attaching correlated `HighlightResult` data to search outputs - New gRPC service definition (`HighlightService`) and `ZillizClient.Highlight()` method for external provider communication **No Data Loss or Regression**: The change is purely additive without modifying existing logic: - Lexical highlighting path remains unchanged (separate switch case in `createHighlightTask`) - New `HighlightResults` field is only populated when semantic highlighting is explicitly requested via `HighlightType_Semantic` enum value - Gracefully handles missing fields by returning explicit errors rather than silent failures - Pipeline operator integration follows existing patterns and only processes when semantic highlighter is instantiated **Why This Design**: Semantic highlighting is routed through the same pipeline operator pattern as lexical highlighting, ensuring consistent integration into search workflows. The per-field model allows flexible highlighting across different text columns and batch processing ensures efficient handling of multiple queries with configurable provider constraints. <!-- end of auto-generated comment: release notes by coderabbit.ai --> Signed-off-by: junjie.jiang <junjie.jiang@zilliz.com>