diff --git a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
index 00ed35f..f97d23c 100644
--- a/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
+++ b/javatests/com/google/gerrit/elasticsearch/ElasticV6QueryChangesTest.java
@@ -21,7 +21,12 @@
 import com.google.gerrit.testing.IndexConfig;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.client.protocol.HttpClientContext;
+import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
+import org.apache.http.impl.nio.client.HttpAsyncClients;
 import org.eclipse.jgit.lib.Config;
+import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 
@@ -33,6 +38,7 @@
 
   private static ElasticNodeInfo nodeInfo;
   private static ElasticContainer container;
+  private static CloseableHttpAsyncClient client;
 
   @BeforeClass
   public static void startIndexService() {
@@ -43,6 +49,8 @@
 
     container = ElasticContainer.createAndStart(ElasticVersion.V6_8);
     nodeInfo = new ElasticNodeInfo(container.getHttpHost().getPort());
+    client = HttpAsyncClients.createDefault();
+    client.start();
   }
 
   @AfterClass
@@ -52,6 +60,16 @@
     }
   }
 
+  @After
+  public void closeIndex() {
+    client.execute(
+        new HttpPost(
+            String.format(
+                "http://localhost:%d/%s*/_close", nodeInfo.port, getSanitizedMethodName())),
+        HttpClientContext.create(),
+        null);
+  }
+
   @Override
   protected void initAfterLifecycleStart() throws Exception {
     super.initAfterLifecycleStart();