fix: upgrade MongoDB vector store from deprecated knnVector to vectorSearch (#3970)#4
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fix: upgrade MongoDB vector store from deprecated knnVector to vectorSearch (#3970)#4
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…Search (mem0ai#3970) Root cause: MongoDB Atlas moved Vector Search to GA, deprecating the knnVector index type and legacy mappings syntax. Additionally, numCandidates was set equal to limit, resulting in poor recall for HNSW indexes. Fix: Use vectorSearch index type with fields array format, numDimensions instead of dimensions, and increase numCandidates to limit * 10 for better search accuracy.
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Fixes mem0ai#3970.
Root cause: MongoDB Atlas deprecated
knnVectorindex type. AlsonumCandidateswas set equal tolimit, resulting in poor recall.Fix: Use
vectorSearchindex type withfieldsarray format,numDimensionsinstead ofdimensions, and increasenumCandidatestolimit * 10.