public Builder setIndexError(com.google.rpc.Status value) {
      if (indexErrorBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        indexError_ = value;
      } else {
        indexErrorBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Output only. If there was an error with indexing the product set, the field
is populated.

This field is ignored when creating a ProductSet.
</pre>

<code>.google.rpc.Status index_error = 4 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ProductSet.java