public Builder mergeUserSpecifiedAnnotation(
        com.google.cloud.visionai.v1.UserSpecifiedAnnotation value) {
      if (userSpecifiedAnnotationBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && userSpecifiedAnnotation_ != null
            && userSpecifiedAnnotation_
                != com.google.cloud.visionai.v1.UserSpecifiedAnnotation.getDefaultInstance()) {
          getUserSpecifiedAnnotationBuilder().mergeFrom(value);
        } else {
          userSpecifiedAnnotation_ = value;
        }
      } else {
        userSpecifiedAnnotationBuilder_.mergeFrom(value);
      }
      if (userSpecifiedAnnotation_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
User provided annotation.
</pre>

<code>.google.cloud.visionai.v1.UserSpecifiedAnnotation user_specified_annotation = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Annotation.java