Ben Chaplin developed HNSW Graph Integrity Checks for the apache/lucene repository, focusing on enhancing index robustness through improved data validation and graph data structure management. He introduced new status objects and verification methods within the CheckIndex utility, enabling automated validation of HNSW graph integrity and connectivity during standard index checks. This approach helps detect inconsistencies early, reducing the risk of corrupted indices and improving diagnosability in indexing workflows. Ben documented the enhancement in the project’s CHANGES file and ensured traceability through detailed commits. His work leveraged Java and emphasized skills in documentation, index maintenance, and robust data validation practices.