public Builder mergeIndexError(com.google.rpc.Status value) {
      if (indexErrorBuilder_ == null) {
        if (((bitField0_ & 0x00000008) != 0)
            && indexError_ != null
            && indexError_ != com.google.rpc.Status.getDefaultInstance()) {
          getIndexErrorBuilder().mergeFrom(value);
        } else {
          indexError_ = value;
        }
      } else {
        indexErrorBuilder_.mergeFrom(value);
      }
      if (indexError_ != null) {
        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