Shreya Bhattacharya contributed to the wazuh-indexer repository by focusing on backend development and performance optimization using Java. She enhanced histogram query throughput by optimizing the DateHistogramAggregator, specifically unwrapping singleton DocValues to minimize redundant calculations in multi-valued scenarios. Additionally, she improved the robustness of high-cardinality aggregations by introducing a direct access path for ordinals of single-valued fields in GlobalOrdinalValuesSource, which addressed potential array index out-of-bounds errors. Her work included updating documentation and cleaning up redundant code, demonstrating a thoughtful approach to both code quality and maintainability. These contributions reflect depth in aggregation and backend engineering.