Upgrade dependency of deprecated Elasticsearch client to 7.17.15.

Original Pull Request #2768
Closes #2764

Author: sothawo

pom.xml

@@ -21,7 +21,7 @@
 		<springdata.commons>3.0.12-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>8.5.3</elasticsearch-java>