public Builder clearContext() {
      bitField0_ = (bitField0_ & ~0x00000800);
      context_ = null;
      if (contextBuilder_ != null) {
        contextBuilder_.dispose();
        contextBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
If present, contextual information is needed to understand where this image
comes from.
</pre>

<code>.google.cloud.vision.v1p2beta1.ImageAnnotationContext context = 21;</code>
java-vision/proto-google-cloud-vision-v1p2beta1/src/main/java/com/google/cloud/vision/v1p2beta1/AnnotateImageResponse.java