(feat) Add field collapse support for search result deduplication with inner_hits support#2251
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This implements Elasticsearch-style field collapsing to deduplicate search results based on a field value. This is useful for scenarios like document chunking where multiple indexed chunks should be represented by only the top-scoring chunk per document. - Collapse results by any stored field with doc values - Returns highest-scoring document per unique field value - Null/missing values grouped together
…pport Enables document chunking workflows where each document is split into multiple searchable chunks, but you want to deduplicate results while still showing multiple relevant chunks per document. - Returns one representative per unique field value (e.g., document_id) - InnerHits retrieve additional documents from each group with independent sorting (e.g., rank groups by relevance, show most recent chunks within each group) - Multiple named inner_hits configurations per collapse - Pagination (from/size) within groups - Second-level collapse for hierarchical grouping Example use cases: - RAG systems: Return top documents, show multiple relevant chunks per document - E-commerce: Group product variants, show different colors/sizes - Search results: Deduplicate by domain, show multiple pages per site Implements hierarchical response structure matching Elasticsearch's collapse feature with full inner_hits support.
abhinavdangeti
requested review from
CascadingRadium,
Likith101,
Thejas-bhat,
abhinavdangeti,
capemox and
maneuvertomars
…lapsing Resolved conflict in search/collector/topn.go: - Updated to use upstream's HybridMergeCallbackFn instead of ScoreExplCorrectionCallbackFunc - Added nestedStore field from upstream - Preserved collapse support with inner_hits
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This implements Elasticsearch-style field collapsing to deduplicate search results based on a field value. This is useful for scenarios like document chunking where multiple indexed chunks should be represented by only the top-scoring chunk per document.