private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.Vcenter,
            com.google.cloud.vmwareengine.v1.Vcenter.Builder,
            com.google.cloud.vmwareengine.v1.VcenterOrBuilder>
        getVcenterFieldBuilder() {
      if (vcenterBuilder_ == null) {
        vcenterBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.Vcenter,
                com.google.cloud.vmwareengine.v1.Vcenter.Builder,
                com.google.cloud.vmwareengine.v1.VcenterOrBuilder>(
                getVcenter(), getParentForChildren(), isClean());
        vcenter_ = null;
      }
      return vcenterBuilder_;
    }
<pre>
Output only. Vcenter appliance.
</pre>

<code>
.google.cloud.vmwareengine.v1.Vcenter vcenter = 19 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/PrivateCloud.java