MB-27666: Nested Fields

[CascadingRadium]

Add support for nested fields in indexing and querying

• Parse and index nested JSON objects
• Enable queries on nested fields
• Preserve hierarchical relationships in index

Requires:

• MB-27666: Nested Fields bleve_index_api#70
• MB-27666: Nested Fields scorch_segment_api#63
• MB-27666: Nested Fields zapx#339

[Copilot]

Pull Request Overview

Add support for nested fields in indexing and querying to enable hierarchical document structures and queries on nested objects. This enhances Bleve's search capabilities by supporting complex nested JSON document structures.

• Parse and index nested JSON objects with preserved hierarchical relationships
• Enable conjunction queries on nested fields with proper document matching across hierarchical levels
• Implement nested-aware collectors, searchers, and mapping functionality

Reviewed Changes

Copilot reviewed 27 out of 27 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
search_test.go	Comprehensive test suite for nested field querying scenarios
search_knn.go	Added nested-aware KNN and eligible collectors
search/util.go	Introduced FieldSet utility for field prefix matching
search/searcher/*.go	Updated searchers to use new ID comparison methods
search/searcher/search_conjunction_nested.go	New nested conjunction searcher implementation
search/search.go	Extended DocumentMatch with descendant tracking
search/scorer/scorer_conjunction_nested.go	New scorer for nested conjunction queries
search/query/*.go	Updated query types and field extraction for nested support
search/highlight/highlighter/simple/highlighter_simple.go	Modified to use new fragment addition method
search/explanation.go	Added merge utilities for explanations and score breakdowns
search/collector/*.go	Enhanced collectors with nested document support
mapping/*.go	Added nested mapping interfaces and field tracking
index_impl.go	Integrated nested-aware collectors and field loading
index/scorch/*.go	Updated index readers to support nested document hierarchy
document/document.go	Extended Document with nested document support

Comments suppressed due to low confidence (1)

search/searcher/search_conjunction_nested.go:1

• Parameter name 'somOfK' appears to be a typo. It should likely be 'sumOfK' to match the usage pattern seen elsewhere in the codebase.

//  Copyright (c) 2025 Couchbase, Inc.

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