During December 2024, Alfonso Glez Luis focused on backend development within the spring-projects/spring-data-elasticsearch repository, addressing a bug related to scripted-field handling in Spring Data Elasticsearch. He enhanced the MappingElasticsearchConverter by introducing logic to verify the existence of scripted fields before populating Java entities, thereby reducing runtime errors and improving data integrity. His approach included writing comprehensive unit tests to cover both default and custom-named scripted fields, ensuring future stability and preventing regressions. Working primarily with Java and leveraging his expertise in Elasticsearch and Spring Data, Alfonso delivered a targeted, well-tested fix that deepened the reliability of entity mapping.