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Add an opt-in Cypher 25 SEARCH strategy with indexed metadata predicates while retaining the default procedure-based search. Include schema validation, Spring Boot configuration, documentation and fixed-vector tests for Neo4j 5.24 and 2026.01. Related to spring-projects#6990. Signed-off-by: HowieDeng <116950190+Shay-Deng@users.noreply.github.com>
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The current procedure-based search takes the global
topKcandidates before applying metadata filters. With five nearer nonmatching documents and ten farther matching documents, a filtered request for five results returns none.Add an opt-in Cypher 25
SEARCHstrategy for Neo4j 2026.01+ that applies supported metadata predicates inside vector index search. KeepVECTOR_QUERYas the default for compatibility. Expose the strategy and filterable metadata fields through the builder and Spring Boot properties, and document setup and restrictions.The new strategy supports equality and range comparisons joined with AND. Values are bound as parameters and identifiers are escaped. Unsupported predicates fail explicitly. Schema initialization creates filtering properties and rejects incompatible existing indexes without migrating them. Externally managed indexes remain the application's responsibility.
Related to #6990. This change addresses post-filtering behavior; it does not establish that the existing procedure bypasses its index or provide performance benchmark claims.
Validation:
verify, including 48 unit tests and 31 integration tests on Neo4j 5.24 and 2026.01, using fixed embeddings without provider API keys../mvnw clean packagepassed: all 169 reactor modules succeeded (JDK 25, Maven build cache disabled).