Upgrade dependency of deprecated Elasticsearch client to 7.17.15.

Origina Pull Request #2769
Closes #2765

Author: sothawo

pom.xml

@@ -21,7 +21,7 @@
 		<springdata.commons>3.1.6-SNAPSHOT</springdata.commons>
 
 		<!-- version of the RestHighLevelClient	-->
-		<elasticsearch-rhlc>7.17.14</elasticsearch-rhlc>
+		<elasticsearch-rhlc>7.17.15</elasticsearch-rhlc>
 		<!-- version of the new ElasticsearchClient	-->
 		<elasticsearch-java>8.7.1</elasticsearch-java>