private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.Nsx,
            com.google.cloud.vmwareengine.v1.Nsx.Builder,
            com.google.cloud.vmwareengine.v1.NsxOrBuilder>
        getNsxFieldBuilder() {
      if (nsxBuilder_ == null) {
        nsxBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.Nsx,
                com.google.cloud.vmwareengine.v1.Nsx.Builder,
                com.google.cloud.vmwareengine.v1.NsxOrBuilder>(
                getNsx(), getParentForChildren(), isClean());
        nsx_ = null;
      }
      return nsxBuilder_;
    }
<pre>
Output only. NSX appliance.
</pre>

<code>
.google.cloud.vmwareengine.v1.Nsx nsx = 18 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/PrivateCloud.java