Upgrade elasticsearch-rest-client to 6.3.2

This version includes several bug fixes, but most are related to
the server rather than the client. This upgrade is only to make
sure we're using the latest version.

Refer to the release notes [1] for details.

Also update the test container to test against version 6.3.2.

[1] https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-6.3.2.html

Change-Id: I80e65f4fe267cf487fddb759b3914e54e31164f3
diff --git a/WORKSPACE b/WORKSPACE
index 52d5a34..efa7149 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -875,8 +875,8 @@
 
 maven_jar(
     name = "elasticsearch-rest-client",
-    artifact = "org.elasticsearch.client:elasticsearch-rest-client:6.3.1",
-    sha1 = "99de036a2cd99dbecec1cc84f5d0e19032e74fa7",
+    artifact = "org.elasticsearch.client:elasticsearch-rest-client:6.3.2",
+    sha1 = "2077ea5f00fdd2d6af85223b730ba8047303297f",
 )
 
 JACKSON_VERSION = "2.6.6"
diff --git a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/testing/ElasticContainer.java b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/testing/ElasticContainer.java
index b2b219a..4ce148c 100644
--- a/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/testing/ElasticContainer.java
+++ b/gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/testing/ElasticContainer.java
@@ -50,7 +50,7 @@
       case V6_2:
         return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.2.4";
       case V6_3:
-        return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.3.1";
+        return "docker.elastic.co/elasticsearch/elasticsearch-oss:6.3.2";
     }
     throw new IllegalStateException("No tests for version: " + version.name());
   }