private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.StretchedClusterConfig,
            com.google.cloud.vmwareengine.v1.StretchedClusterConfig.Builder,
            com.google.cloud.vmwareengine.v1.StretchedClusterConfigOrBuilder>
        getStretchedClusterConfigFieldBuilder() {
      if (stretchedClusterConfigBuilder_ == null) {
        stretchedClusterConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.StretchedClusterConfig,
                com.google.cloud.vmwareengine.v1.StretchedClusterConfig.Builder,
                com.google.cloud.vmwareengine.v1.StretchedClusterConfigOrBuilder>(
                getStretchedClusterConfig(), getParentForChildren(), isClean());
        stretchedClusterConfig_ = null;
      }
      return stretchedClusterConfigBuilder_;
    }
<pre>
Optional. Configuration of a stretched cluster. Required for clusters that
belong to a STRETCHED private cloud.
</pre>

<code>
.google.cloud.vmwareengine.v1.StretchedClusterConfig stretched_cluster_config = 17 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/Cluster.java