Support highlighter

[yhmo]

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This pull-request has been approved by: yhmo

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[gemini-code-assist]

Summary of Changes

Hello @yhmo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Milvus Java SDK by introducing robust support for search result highlighting. It provides a flexible framework for users to define and apply various highlighting strategies, both lexical and semantic, directly within their search requests. The changes ensure that the SDK can effectively communicate these preferences to the Milvus server and accurately parse the enriched search responses, ultimately improving the clarity and utility of search results for end-users.

Highlights

• New Highlighter Interface and Implementations: Introduced a new Highlighter interface along with two concrete implementations: LexicalHighlighter for keyword-based highlighting and SemanticHighlighter for context-aware highlighting. These allow users to specify how search results should be visually emphasized.
• Integration with Search Request: The SearchReq object has been extended to include a Highlighter field, enabling users to configure highlighting options directly within their search queries. This includes a builder pattern for easy construction of highlighter settings.
• Enriched Search Response: The SearchResp.SearchResult class now includes a highlightResults map, which stores detailed HighlightResult objects for each field. A new HighlightResult inner class has been added to encapsulate highlighted fragments and their scores.
• Internal Utility Enhancements: Modified SearchResultsWrapper to expose Position and getOffsetByIndex for external use, facilitating the processing of highlight data. ConvertUtils and VectorUtils were updated to handle the serialization of highlighter configurations for gRPC requests and the deserialization of highlight results from gRPC responses.
• Protocol Buffer Update: The underlying Milvus protocol definitions have been updated to support the new highlighter functionality, indicated by a subproject commit change.

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[gemini-code-assist]

Code Review

This pull request introduces support for search result highlighting by adding a Highlighter interface with LexicalHighlighter and SemanticHighlighter implementations. The changes span across request building, gRPC conversion, and response parsing to accommodate this new feature. The implementation is comprehensive, but I've identified a critical runtime bug in the gRPC type conversion that needs to be addressed, along with a minor maintainability improvement to remove redundant code.