ElasticContainer: suppress unclosed resource warning

The close method has a default implementation in the interface Startable
which calls container.stop(). We already call stop() in the
stopElasticsearchServer() method of the abstract test classes which are
called via @AfterClass junit annotation when all tests in the respective
test class have been executed.

Change-Id: I5d4831f21b4825fe8a92105c34bbe255123c7b85
diff --git a/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java b/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
index 5e4fd89..caacba4 100644
--- a/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -30,6 +30,7 @@
   private static final int ELASTICSEARCH_DEFAULT_PORT = 9200;
 
   public static ElasticContainer createAndStart(ElasticVersion version) {
+    @SuppressWarnings("resource")
     ElasticContainer container = new ElasticContainer(version);
     try {
       Path certs = Path.of("/usr/share/elasticsearch/config/certs");