private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails,
            com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails.Builder,
            com.google.cloud.vmmigration.v1.ComputeEngineTargetDetailsOrBuilder>
        getComputeEngineTargetDetailsFieldBuilder() {
      if (computeEngineTargetDetailsBuilder_ == null) {
        if (!(targetVmDetailsCase_ == 14)) {
          targetVmDetails_ =
              com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails.getDefaultInstance();
        }
        computeEngineTargetDetailsBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails,
                com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails.Builder,
                com.google.cloud.vmmigration.v1.ComputeEngineTargetDetailsOrBuilder>(
                (com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails) targetVmDetails_,
                getParentForChildren(),
                isClean());
        targetVmDetails_ = null;
      }
      targetVmDetailsCase_ = 14;
      onChanged();
      return computeEngineTargetDetailsBuilder_;
    }
<pre>
Output only. Details of the target VM in Compute Engine.
</pre>

<code>
.google.cloud.vmmigration.v1.ComputeEngineTargetDetails compute_engine_target_details = 14 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/CutoverJob.java