public Builder clearUpdateMask() {
      bitField0_ = (bitField0_ & ~0x00000002);
      updateMask_ = null;
      if (updateMaskBuilder_ != null) {
        updateMaskBuilder_.dispose();
        updateMaskBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The [FieldMask][google.protobuf.FieldMask] that specifies which fields
to update.
If update_mask isn't specified, all mutable fields are to be updated.
Valid mask paths include `product_labels`, `display_name`, and
`description`.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2;</code>
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/UpdateProductRequest.java