Worked on stabilizing the elastic/mcp-server-elasticsearch repository by addressing a critical regression affecting server startup when no API key was provided. Focused on backend development and configuration management using TypeScript, the work ensured that environment variables for username, password, and related fields were correctly assigned even if left empty. This approach improved the reliability of Elasticsearch integration, allowing the server to initialize properly in various deployment scenarios and reducing the risk of startup failures. The changes clarified the initialization logic, enhanced maintainability, and prevented potential downstream issues, contributing to a more robust and resilient deployment process for the system.