Upgrade elasticsearch-rest-client to 7.2.1

Also update ElasticContainer to use this version for tests.

Note that Elasticsearch version 7.3 is now available, but upgrading
to use that is out of this commit's scope and will be done separately.

Change-Id: I457de1afef96b5bf19cfbe6aedfd08e622d6f9b5

WORKSPACE

@@ -925,8 +925,8 @@ maven_jar(
 # and httpasyncclient as necessary.
 maven_jar(
     name = "elasticsearch-rest-client",
-    artifact = "org.elasticsearch.client:elasticsearch-rest-client:7.2.0",
-    sha1 = "39cf34068b0af284eaa9b8bd86a131cb24b322d5",
+    artifact = "org.elasticsearch.client:elasticsearch-rest-client:7.2.1",
+    sha1 = "5303a802c02e67683ce30b7e9a23d2e9c523782b",
 )
 
 maven_jar(

gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java

@@ -55,7 +55,7 @@ public class ElasticContainer extends ElasticsearchContainer {
       case V7_1:
         return "blacktop/elasticsearch:7.1.1";
       case V7_2:
-        return "blacktop/elasticsearch:7.2.0";
+        return "blacktop/elasticsearch:7.2.1";
     }
     throw new IllegalStateException("No tests for version: " + version.name());
   }