Worked on the dnhatn/elasticsearch repository to enhance security for Entity Analytics by addressing a bug related to system index access control. The solution involved adding a dot prefix to the entity analytics system indices within the role descriptor, a change that aligns with established security practices and reduces the risk of unauthorized data exposure. This targeted update, implemented in Java, focused on backend development and role-based access control, directly supporting compliance requirements. The work was tied to a specific security issue and prepared for production validation, demonstrating a methodical approach to security management and careful integration with existing access control mechanisms.