ElasticContainer: Upgrade to 6.8.2 image for V6_8 tests

Change-Id: I4431a6a7939f9ee1a81c3f37b8315b5906de7bfd
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 313434a..1777b3a 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
@@ -51,7 +51,7 @@
       case V6_7:
         return "blacktop/elasticsearch:6.7.2";
       case V6_8:
-        return "blacktop/elasticsearch:6.8.1";
+        return "blacktop/elasticsearch:6.8.2";
       case V7_0:
         return "blacktop/elasticsearch:7.0.1";
       case V7_1: