Refactoring to prepare for removal of the old deprecated RestHighLevelClient integration.

Original Pull Request #2559 
Closes #2557

Author: sothawo

src/main/asciidoc/reference/elasticsearch-new.adoc

@@ -9,7 +9,7 @@
 [[new-features.5-1-0]]
 == New in Spring Data Elasticsearch 5.1
 
-* Upgrade to Elasticsearch 8.7.0
+* Upgrade to Elasticsearch 8.7.1
 * Allow specification of the TLS certificate when connecting to an Elasticsearch 8 cluster 
 
 [[new-features.5-0-0]]

src/main/java/org/springframework/data/elasticsearch/core/ReactiveElasticsearchOperations.java

@@ -17,7 +17,6 @@
 
 import org.reactivestreams.Publisher;
 import org.springframework.data.elasticsearch.client.erhlc.ReactiveElasticsearchClient;
-import org.springframework.data.elasticsearch.client.erhlc.ReactiveElasticsearchTemplate;
 import org.springframework.data.elasticsearch.core.cluster.ReactiveClusterOperations;
 import org.springframework.data.elasticsearch.core.convert.ElasticsearchConverter;
 import org.springframework.data.elasticsearch.core.mapping.ElasticsearchPersistentEntity;
@@ -28,11 +27,6 @@
 
 /**
  * Interface that specifies a basic set of Elasticsearch operations executed in a reactive way.
- * <p>
- * Implemented by {@link ReactiveElasticsearchTemplate}. Not often used but a useful option for extensibility and
- * testability (as it can be easily mocked, stubbed, or be the target of a JDK proxy). Command execution using
- * {@link ReactiveElasticsearchOperations} is deferred until a {@link org.reactivestreams.Subscriber} subscribes to the
- * {@link Publisher}.
  *
  * @author Christoph Strobl
  * @author Peter-Josef Meisch