#553 - Upgrade Elasticsearch examples to Spring Boot 2.3.

Author: mp911de

elasticsearch/example/src/main/java/example/springdata/elasticsearch/conference/ApplicationConfiguration.java

@@ -62,13 +62,13 @@ public ElasticsearchTemplate elasticsearchTemplate(Client client) throws Excepti
 
 	@PreDestroy
 	public void deleteIndex() {
-		operations.getIndexOperations().deleteIndex(Conference.class);
+		operations.indexOps(Conference.class).delete();
 	}
 
 	@PostConstruct
 	public void insertDataSample() {
 
-		operations.getIndexOperations().refresh(Conference.class);
+		operations.indexOps(Conference.class).refresh();
 
 		// Save data sample
 		repository.save(Conference.builder().date("2014-11-06").name("Spring eXchange 2014 - London")

elasticsearch/rest/src/main/java/example/springdata/elasticsearch/conference/ApplicationConfiguration.java

@@ -49,14 +49,14 @@ public RestHighLevelClient elasticsearchClient() {
 
 	@PreDestroy
 	public void deleteIndex() {
-		elasticsearchOperations.getIndexOperations().refresh(Conference.class);
+		elasticsearchOperations.indexOps(Conference.class).delete();
 	}
 
 	@PostConstruct
 	public void insertDataSample() {
 
 		repository.deleteAll();
-		elasticsearchOperations.getIndexOperations().refresh(Conference.class);
+		elasticsearchOperations.indexOps(Conference.class).refresh();
 
 		// Save data sample
 		repository.save(Conference.builder().date("2014-11-06").name("Spring eXchange 2014 - London")