@java.lang.Override
    public Builder clearField(com.google.protobuf.Descriptors.FieldDescriptor field) {
      return super.clearField(field);
    }
<pre>
External image source (Google Cloud Storage or web URL image location).
</pre>

Protobuf type {@code google.cloud.vision.v1.ImageSource}
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ImageSource.java