Rahul Goswami upgraded the Lucene dependency to version 10.4.0 in the apache/solr repository, focusing on enhancing vector search compatibility and maintainability. He migrated ScalarQuantizedDenseVectorField to the new Lucene104HnswScalarQuantizedVectorsFormat, updating codec implementations and deprecating several parameters while ensuring backward compatibility through DeprecationLog warnings. Rahul also replaced BinaryQuantizedDenseVectorField with a more efficient encoding and refreshed related documentation and test configurations to align with the latest API changes. Working primarily in Java and leveraging deep knowledge of Lucene and Solr backend development, his work addressed upgrade risks and improved the long-term stability of vector search features.