Set refresh on DeleteByQueryRequest by DeleteQuery.

Original Pull Request #2976
Closes #2973

Author: tuguri8

Diff for: src/main/java/org/springframework/data/elasticsearch/client/elc/RequestConverter.java

@@ -1045,6 +1045,9 @@ public DeleteByQueryRequest documentDeleteByQueryRequest(DeleteQuery query, @Nul
 									.collect(Collectors.toList()));
 				}
 			}
+			if (query.getRefresh() != null) {
+				dqb.refresh(query.getRefresh());
+			}
 			dqb.allowNoIndices(query.getAllowNoIndices())
 					.conflicts(conflicts(query.getConflicts()))
 					.ignoreUnavailable(query.getIgnoreUnavailable())

Diff for: src/test/java/org/springframework/data/elasticsearch/client/elc/RequestConverterTest.java

@@ -30,12 +30,16 @@
 import org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.IndexCoordinates;
 import org.springframework.data.elasticsearch.core.mapping.SimpleElasticsearchMappingContext;
+import org.springframework.data.elasticsearch.core.query.Criteria;
+import org.springframework.data.elasticsearch.core.query.CriteriaQuery;
+import org.springframework.data.elasticsearch.core.query.DeleteQuery;
 import org.springframework.data.elasticsearch.core.query.DocValueField;
 import org.springframework.data.elasticsearch.core.query.StringQuery;
 import org.springframework.lang.Nullable;
 
 /**
  * @author Peter-Josef Meisch
+ * @author Han Seungwoo
  */
 class RequestConverterTest {
 
@@ -72,6 +76,19 @@ void shouldAddDocvalueFields() {
 		assertThat(fieldAndFormats.get(1).format()).isEqualTo("format2");
 	}
 
+	@Test // #2973
+	@DisplayName("should set refresh based on deleteRequest")
+	void refreshSetByDeleteRequest() {
+		var query = new CriteriaQuery(new Criteria("text").contains("test"));
+		var deleteQuery = DeleteQuery.builder(query).withRefresh(true).build();
+
+		var deleteByQueryRequest = requestConverter.documentDeleteByQueryRequest(deleteQuery, null, SampleEntity.class,
+			IndexCoordinates.of("foo"),
+			null);
+
+		assertThat(deleteByQueryRequest.refresh()).isTrue();
+	}
+
 	@Document(indexName = "does-not-matter")
 	static class SampleEntity {
 		@Nullable