Upgrade to Elasticsearch 6.8.3

Closes gh-18159

Author: wilkinsona

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -62,7 +62,7 @@
 		<embedded-mongo.version>2.2.0</embedded-mongo.version>
 		<flyway.version>6.0.1</flyway.version>
 		<freemarker.version>2.3.29</freemarker.version>
-		<elasticsearch.version>6.8.2</elasticsearch.version>
+		<elasticsearch.version>6.8.3</elasticsearch.version>
 		<glassfish-el.version>3.0.2</glassfish-el.version>
 		<glassfish-jaxb.version>2.3.2</glassfish-jaxb.version>
 		<groovy.version>2.5.8</groovy.version>