public Builder setDisplayNameMappingKey(java.lang.String value) {
        if (value == null) {
          throw new NullPointerException();
        }
        displayNameMappingCase_ = 2;
        displayNameMapping_ = value;
        onChanged();
        return this;
      }
<pre>
Specify a field name in the prediction to look for the display name.

Use this if the prediction contains the display names for the outputs.

The display names in the prediction must have the same shape of the
outputs, so that it can be located by
[Attribution.output_index][google.cloud.aiplatform.v1.Attribution.output_index]
for a specific output.
</pre>

<code>string display_name_mapping_key = 2;</code>

@param value The displayNameMappingKey to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ExplanationMetadata.java