Upgrade to Elasticsearch 7.17.9.

Original Pull Request #2456
Closes #2454

Author: sothawo

pom.xml

@@ -21,7 +21,7 @@
 		<springdata.commons>3.0.2-SNAPSHOT</springdata.commons>
 
 		<!-- version of the RestHighLevelClient	-->
-		<elasticsearch-rhlc>7.17.8</elasticsearch-rhlc>
+		<elasticsearch-rhlc>7.17.9</elasticsearch-rhlc>
 		<!-- version of the new ElasticsearchClient	-->
 		<elasticsearch-java>8.5.3</elasticsearch-java>
 

src/main/asciidoc/reference/elasticsearch-migration-guide-4.4-5.0.adoc

@@ -154,7 +154,7 @@ The old deprecated `RestHighLevelClient` can still be used, but you will need to
 <dependency>
 	<groupId>org.elasticsearch.client</groupId>
 	<artifactId>elasticsearch-rest-high-level-client</artifactId>
-	<version>7.17.5</version>
+	<version>7.17.9</version>
 	<exclusions>
 		<exclusion>
 			<groupId>commons-logging</groupId>
@@ -165,4 +165,4 @@ The old deprecated `RestHighLevelClient` can still be used, but you will need to
 ----
 ====
 
-Make sure to specify the version 7.17.6 explicitly, otherwise maven will resolve to 8.5.3, and this does not exist.
+Make sure to specify the version 7.17.9 explicitly, otherwise maven will resolve to 8.5.3, and this does not exist.