@@ -873,7 +873,13 @@ public UnaryCallable<DeleteClientTlsPolicyRequest, Operation> deleteClientTlsPol
 
 @Override
 public final void close() {
-shutdown();
+try {
+backgroundResources.close();
+} catch (RuntimeException e) {
+throw e;
+} catch (Exception e) {
+throw new IllegalStateException("Failed to close resource", e);
+}
 }
 
 @Override