fix cancellatin handling

Change-Id: I2a67942d135183c4f0b316e626b578041026c808

Author: igorbernstein2

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/Util.java

@@ -64,6 +64,7 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Optional;
+import java.util.concurrent.CancellationException;
 import java.util.concurrent.ScheduledExecutorService;
 import javax.annotation.Nullable;
 
@@ -79,6 +80,10 @@ public static Status.Code extractStatus(@Nullable Throwable error) {
     if (error == null) {
       return Status.Code.OK;
     }
+    // Handle java CancellationException as if it was a gax CancelledException
+    if (error instanceof CancellationException) {
+      return Status.Code.CANCELLED;
+    }
     if (error instanceof ApiException) {
       ApiException apiException = (ApiException) error;
       if (apiException.getStatusCode() instanceof GrpcStatusCode) {