Expose KeyValueAdapter from KeyValueOperations.

See #563

src/main/java/org/springframework/data/keyvalue/core/KeyValueOperations.java

@@ -191,4 +191,10 @@ public interface KeyValueOperations extends DisposableBean {
 	 * @return mapping context in use.
 	 */
 	MappingContext<?, ?> getMappingContext();
+
+	/**
+	 * @return {@link KeyValueAdapter} in use.
+	 * @since 3.2.4
+	 */
+	KeyValueAdapter getKeyValueAdapter();
 }

src/main/java/org/springframework/data/keyvalue/core/KeyValueTemplate.java

@@ -387,6 +387,11 @@ public class KeyValueTemplate implements KeyValueOperations, ApplicationEventPub
 		return this.mappingContext;
 	}
 
+	@Override
+	public KeyValueAdapter getKeyValueAdapter() {
+		return adapter;
+	}
+
 	@Override
 	public void destroy() throws Exception {
 		this.adapter.clear();