Mute Netty4HeadBodyIsEmptyIT.testTemplateExists

modules/transport-netty4/src/javaRestTest/java/org/elasticsearch/rest/Netty4HeadBodyIsEmptyIT.java

@@ -98,6 +98,7 @@ public class Netty4HeadBodyIsEmptyIT extends ESRestTestCase {
         headTestCase("/test/_alias/test_alias", emptyMap(), NOT_FOUND.getStatus(), greaterThan(0));
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/71664")
     public void testTemplateExists() throws IOException {
         try (XContentBuilder builder = jsonBuilder()) {
             builder.startObject();