Fix missing return value in ByQueryResponse.

Original Pull Request #3109
Closes #3108

Signed-off-by: Peter-Josef Meisch <pj.meisch@sothawo.com>
(cherry picked from commit ebbe242)

Author: sothawo

src/main/java/org/springframework/data/elasticsearch/client/elc/ResponseConverter.java

@@ -500,6 +500,10 @@ public ByQueryResponse byQueryResponse(UpdateByQueryResponse response) {
 			builder.withDeleted(response.deleted());
 		}
 
+		if(response.updated() != null) {
+			builder.withUpdated(response.updated());
+		}
+
 		if (response.batches() != null) {
 			builder.withBatches(Math.toIntExact(response.batches()));
 		}

src/test/java/org/springframework/data/elasticsearch/core/ElasticsearchIntegrationTests.java

@@ -1636,7 +1636,9 @@ void shouldDoUpdateByQueryForExistingDocument() {
 				.withParams(Collections.singletonMap("newMessage", messageAfterUpdate)).withAbortOnVersionConflict(true)
 				.build();
 
-		operations.updateByQuery(updateQuery, IndexCoordinates.of(indexNameProvider.indexName()));
+		var byQueryResponse = operations.updateByQuery(updateQuery, IndexCoordinates.of(indexNameProvider.indexName()));
+
+		assertThat(byQueryResponse.getUpdated()).isEqualTo(1);
 
 		SampleEntity indexedEntity = operations.get(documentId, SampleEntity.class,
 				IndexCoordinates.of(indexNameProvider.indexName()));