fix(index): support HNSW segment merge#7178
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BubbleCal
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Jun 9, 2026
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HNSW distributed index builds can currently create multiple index segments, but the physical merge path did not preserve a usable HNSW graph in the merged root index.
This PR rebuilds the HNSW graph from merged auxiliary storage during segment merge for IVF_HNSW_FLAT, IVF_HNSW_PQ, and IVF_HNSW_SQ. It preserves merged IVF/storage metadata, validates that source HNSW build parameters are consistent before rebuilding, and rejects ambiguous merges instead of producing order-dependent graphs.
Fixes #6309.