private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.telcoautomation.v1.OrchestrationCluster,
            com.google.cloud.telcoautomation.v1.OrchestrationCluster.Builder,
            com.google.cloud.telcoautomation.v1.OrchestrationClusterOrBuilder>
        getOrchestrationClusterFieldBuilder() {
      if (orchestrationClusterBuilder_ == null) {
        orchestrationClusterBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.telcoautomation.v1.OrchestrationCluster,
                com.google.cloud.telcoautomation.v1.OrchestrationCluster.Builder,
                com.google.cloud.telcoautomation.v1.OrchestrationClusterOrBuilder>(
                getOrchestrationCluster(), getParentForChildren(), isClean());
        orchestrationCluster_ = null;
      }
      return orchestrationClusterBuilder_;
    }
<pre>
Required. The resource being created
</pre>

<code>
.google.cloud.telcoautomation.v1.OrchestrationCluster orchestration_cluster = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/CreateOrchestrationClusterRequest.java