public Builder addIndexFeatureMapping(java.lang.String value) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureIndexFeatureMappingIsMutable();
        indexFeatureMapping_.add(value);
        bitField0_ |= 0x00000080;
        onChanged();
        return this;
      }
<pre>
A list of feature names for each index in the input tensor.
Required when the input
[InputMetadata.encoding][google.cloud.aiplatform.v1.ExplanationMetadata.InputMetadata.encoding]
is BAG_OF_FEATURES, BAG_OF_FEATURES_SPARSE, INDICATOR.
</pre>

<code>repeated string index_feature_mapping = 8;</code>

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