In September 2025, Mikhail Korotkov enhanced the apache/ignite repository by clarifying the API contract for the IndexQuery.getCriteria method. He annotated this Java method with @Nullable, explicitly indicating that it may return null and thereby reducing the risk of downstream null-pointer exceptions. This targeted change improved API reliability and aligned with broader efforts to strengthen code documentation and design. By focusing on minimal surface-area impact, Mikhail ensured that existing integrations required little adjustment while benefiting from clearer expectations. His work demonstrated a thoughtful approach to API design, emphasizing maintainability and safety in Java-based systems through precise documentation and annotation practices.