diff --git a/src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchRestTemplate.java b/src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchRestTemplate.java
index cb8596c10..9ce3c5285 100644
--- a/src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchRestTemplate.java
+++ b/src/main/java/org/springframework/data/elasticsearch/core/ElasticsearchRestTemplate.java
@@ -320,7 +320,7 @@ public class ElasticsearchRestTemplate extends AbstractElasticsearchTemplate {
 	 * @since 4.0
 	 */
 	@FunctionalInterface
-	interface ClientCallback<T> {
+	public interface ClientCallback<T> {
 		T doWithClient(RestHighLevelClient client) throws IOException;
 	}