Upgrade Elasticsearch server to 9.0.3 vor reactive tests.

Author: schauder

elasticsearch/reactive/src/test/java/example/springdata/elasticsearch/conference/ReactiveElasticsearchOperationsTest.java

@@ -54,7 +54,7 @@ class ReactiveElasticsearchOperationsTest {
 
 	@Container //
 	private static final ElasticsearchContainer container = new ElasticsearchContainer(
-			DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch:8.7.0")) //
+			DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch:9.0.3")) //
 			.withPassword("foobar") //
 			.withReuse(true);
 

elasticsearch/reactive/src/test/java/example/springdata/elasticsearch/conference/ReactiveElasticsearchRepositoryTest.java

@@ -50,7 +50,7 @@ class ReactiveElasticsearchRepositoryTest {
 
 	@Container //
 	private static final ElasticsearchContainer container = new ElasticsearchContainer(
-			DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch:8.7.0")) //
+			DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch:9.0.3")) //
 			.withPassword("foobar") //
 			.withReuse(true);