[Docs] Correct javadoc of GetIndexRequest (#29364)

Author: scampi

core/src/main/java/org/elasticsearch/action/admin/indices/get/GetIndexRequest.java

@@ -30,7 +30,7 @@
 import java.util.List;
 
 /**
- * A request to delete an index. Best created with {@link org.elasticsearch.client.Requests#deleteIndexRequest(String)}.
+ * A request to retrieve information about an index.
  */
 public class GetIndexRequest extends ClusterInfoRequest<GetIndexRequest> {