fix another test

Author: jimczi

server/src/test/java/org/elasticsearch/index/mapper/vectors/DenseVectorFieldMapperTests.java

@@ -1550,7 +1550,8 @@ protected void assertFetch(MapperService mapperService, String field, Object val
         ValueFetcher nativeFetcher = ft.valueFetcher(searchExecutionContext, format);
         ParsedDocument doc = mapperService.documentMapper().parse(source);
         withLuceneIndex(mapperService, iw -> iw.addDocuments(doc.docs()), ir -> {
-            Source s = SourceProvider.fromStoredFields().getSource(ir.leaves().get(0), 0);
+            Source s = SourceProvider.fromLookup(mapperService.mappingLookup(), mapperService.getMapperMetrics().sourceFieldMetrics())
+                .getSource(ir.leaves().get(0), 0);
             nativeFetcher.setNextReader(ir.leaves().get(0));
             List<Object> fromNative = nativeFetcher.fetchValues(s, 0, new ArrayList<>());
             DenseVectorFieldType denseVectorFieldType = (DenseVectorFieldType) ft;