Worked on the apache/lucene repository to deliver a memory optimization feature focused on large-scale indexing workloads. The main contribution involved refactoring the NeighborArray data structure to utilize MaxSizedIntArrayList and MaxSizedFloatArrayList, replacing primitive arrays to reduce heap memory usage and improve garbage collection predictability. This Java-based enhancement required careful adjustment of score access logic to ensure compatibility with the new memory layout while maintaining correctness. Robust tests were added to validate the optimized implementation and prevent regressions. The work demonstrated strong skills in algorithm optimization, data structures, and memory management, with an emphasis on scalable, maintainable code improvements.