public final Annotation updateAnnotation(Annotation annotation, FieldMask updateMask) {
    UpdateAnnotationRequest request =
        UpdateAnnotationRequest.newBuilder()
            .setAnnotation(annotation)
            .setUpdateMask(updateMask)
            .build();
    return updateAnnotation(request);
  }
Updates annotation inside asset.

<p>Sample code:

<pre>{@code
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (WarehouseClient warehouseClient = WarehouseClient.create()) {
  Annotation annotation = Annotation.newBuilder().build();
  FieldMask updateMask = FieldMask.newBuilder().build();
  Annotation response = warehouseClient.updateAnnotation(annotation, updateMask);
}
}</pre>

@param annotation Required. The annotation to update. The annotation's `name` field is used to
    identify the annotation to be updated. Format:
    `projects/{project_number}/locations/{location}/corpora/{corpus}/assets/{asset}/annotations/{annotation}`
@param updateMask The list of fields to be updated.
@throws com.google.api.gax.rpc.ApiException if the remote call fails
java-visionai/google-cloud-visionai/src/main/java/com/google/cloud/visionai/v1/WarehouseClient.java