private com.google.protobuf.MapField<
          java.lang.String, com.google.cloud.vmwareengine.v1.NodeTypeConfig>
      internalGetNodeTypeConfigs() {
    if (nodeTypeConfigs_ == null) {
      return com.google.protobuf.MapField.emptyMapField(
          NodeTypeConfigsDefaultEntryHolder.defaultEntry);
    }
    return nodeTypeConfigs_;
  }
<pre>
Output only. System-generated unique identifier for the resource.
</pre>

<code>string uid = 14 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for uid.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/Cluster.java