private void ensureConfidencesIsMutable() {
      if (!confidences_.isModifiable()) {
        confidences_ = makeMutableCopy(confidences_);
      }
      bitField0_ |= 0x00000004;
    }
<pre>
The display names of the AnnotationSpecs that had been identified, order
matches the IDs.
</pre>

<code>repeated string display_names = 2;</code>

@param value The bytes of the displayNames to add.
@return This builder for chaining.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ClassificationPredictionResult.java