Upgrade to Elasticsearch 6.7.1

Closes gh-16569

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchHealthIndicatorTests.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -176,7 +176,7 @@ public class ElasticsearchHealthIndicatorTests {
 			super("test-cluster", new String[0],
 					new ClusterState(null, 0, null, null, RoutingTable.builder().build(),
 							DiscoveryNodes.builder().build(),
-							ClusterBlocks.builder().build(), null, false));
+							ClusterBlocks.builder().build(), null, 1, false));
 			this.status = status;
 		}
 

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

@@ -60,7 +60,7 @@
 		<embedded-mongo.version>2.2.0</embedded-mongo.version>
 		<flyway.version>5.2.4</flyway.version>
 		<freemarker.version>2.3.28</freemarker.version>
-		<elasticsearch.version>6.6.2</elasticsearch.version>
+		<elasticsearch.version>6.7.1</elasticsearch.version>
 		<glassfish-el.version>3.0.2</glassfish-el.version>
 		<glassfish-jaxb.version>2.3.2</glassfish-jaxb.version>
 		<groovy.version>2.5.6</groovy.version>