Support element filter search for struct field

[yhmo]

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Pull request overview

This PR adds support for element-level filtering in struct field searches by propagating an elementLevel flag through the search pipeline and exposing element offset information in search results.

Changes:

• Added elementLevel parameter to placeholder conversion methods to support element-level search filtering
• Extended SearchResult to include elementOffset field for tracking matched element positions
• Modified search request conversion to detect element_filter in query strings and set the appropriate flag

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sdk-core/src/main/milvus-proto	Updated subproject commit reference to include element-level search support
sdk-core/src/main/java/io/milvus/v2/utils/VectorUtils.java	Added elementLevel parameter propagation through search request conversion methods
sdk-core/src/main/java/io/milvus/v2/utils/ConvertUtils.java	Added logic to extract and set element offset from search results
sdk-core/src/main/java/io/milvus/v2/service/vector/response/SearchResp.java	Added elementOffset field to SearchResult class with getter/setter and builder support
sdk-core/src/main/java/io/milvus/param/ParamUtils.java	Added overloaded convertPlaceholder method with elementLevel parameter

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