Update elasticsearch-new.adoc

Author: sothawo

src/main/antora/modules/ROOT/pages/elasticsearch/elasticsearch-new.adoc

@@ -7,6 +7,7 @@
 * Upgrade to Elasticsearch 8.15.0.
 * Allow to customize the mapped type name for `@InnerField` and `@Field` annotations.
 * Support for Elasticsearch SQL.
+* Add support for retrieving request executionDuration.    
 
 [[new-features.5-3-0]]
 == New in Spring Data Elasticsearch 5.3