@java.lang.Override
    public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
      return super.setUnknownFields(unknownFields);
    }
<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-v1/src/main/java/com/google/cloud/vision/v1/UpdateProductRequest.java