ElasticContainer: Use Elasticsearch 6.7.2 for V6_7 tests

Change-Id: Ic366e2c9e78178dcf7528d54d7e877961ee7ebd6
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
index f8d8c57..56ffed8 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -49,7 +49,7 @@
       case V6_6:
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.6.2";
       case V6_7:
-        return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.7.1";
+        return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.7.2";
       case V7_0:
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.1";
     }