private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.Cluster,
            com.google.cloud.vmwareengine.v1.Cluster.Builder,
            com.google.cloud.vmwareengine.v1.ClusterOrBuilder>
        getClusterFieldBuilder() {
      if (clusterBuilder_ == null) {
        clusterBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.Cluster,
                com.google.cloud.vmwareengine.v1.Cluster.Builder,
                com.google.cloud.vmwareengine.v1.ClusterOrBuilder>(
                getCluster(), getParentForChildren(), isClean());
        cluster_ = null;
      }
      return clusterBuilder_;
    }
<pre>
Required. The initial description of the new cluster.
</pre>

<code>
.google.cloud.vmwareengine.v1.Cluster cluster = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/CreateClusterRequest.java