private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.Index,
            com.google.cloud.visionai.v1.Index.Builder,
            com.google.cloud.visionai.v1.IndexOrBuilder>
        getIndexFieldBuilder() {
      if (indexBuilder_ == null) {
        indexBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.Index,
                com.google.cloud.visionai.v1.Index.Builder,
                com.google.cloud.visionai.v1.IndexOrBuilder>(
                getIndex(), getParentForChildren(), isClean());
        index_ = null;
      }
      return indexBuilder_;
    }
<pre>
Required. The resource being updated.
</pre>

<code>.google.cloud.visionai.v1.Index index = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UpdateIndexRequest.java