Worked on the apache/lucene repository to enhance Lucene’s index opening compatibility by introducing per-segment version checks that enforce alignment with the major Lucene version. Leveraging Java and back end development skills, addressed compatibility edge-cases related to indexCreatedVersionMajor by streamlining the parsing of segment information, which improved backward compatibility for older index formats. Improved error messaging for unsupported index versions, making it easier for users to diagnose compatibility issues. The work focused on software architecture principles to ensure robust handling of version mismatches, resulting in a more resilient and maintainable codebase for Lucene’s index management and upgrade workflows.