Upgrade to Elasticsearch 5.5.0

Closes gh-9833

spring-boot-dependencies/pom.xml

@@ -76,7 +76,7 @@
 		<embedded-mongo.version>2.0.0</embedded-mongo.version>
 		<flyway.version>4.2.0</flyway.version>
 		<freemarker.version>2.3.26-incubating</freemarker.version>
-		<elasticsearch.version>5.4.3</elasticsearch.version>
+		<elasticsearch.version>5.5.0</elasticsearch.version>
 		<glassfish-el.version>3.0.0</glassfish-el.version>
 		<groovy.version>2.5.0-beta-1</groovy.version>
 		<gson.version>2.8.1</gson.version>