test registration

Author: rjernst

server/src/test/java/org/elasticsearch/ExceptionSerializationTests.java

@@ -146,7 +146,8 @@ public void testExceptionRegistration() throws IOException, URISyntaxException {
         final Set<? extends Class<?>> ignore = Sets.newHashSet(
             CancellableThreadsTests.CustomException.class,
             RestResponseTests.WithHeadersException.class,
-            AbstractClientHeadersTestCase.InternalException.class
+            AbstractClientHeadersTestCase.InternalException.class,
+            ElasticsearchExceptionTests.ExceptionSubclass.class
         );
         FileVisitor<Path> visitor = new FileVisitor<Path>() {
             private Path pkgPrefix = PathUtils.get(path).getParent();