ElasticContainer: Use version 7.0.0-rc1 for V7_0 tests

Change-Id: I4d415ca36033098286e32f2de26c7b711972af55
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 10b4963..794a381 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 "docker.elastic.co/elasticsearch/elasticsearch-oss:6.7.0";
       case V7_0:
-        return "docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.0-beta1";
+        return "docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.0-rc1";
     }
     throw new IllegalStateException("No tests for version: " + version.name());
   }