public Builder mergeComputeEngineTargetDetails(
        com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails value) {
      if (computeEngineTargetDetailsBuilder_ == null) {
        if (targetVmDetailsCase_ == 14
            && targetVmDetails_
                != com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails
                    .getDefaultInstance()) {
          targetVmDetails_ =
              com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails.newBuilder(
                      (com.google.cloud.vmmigration.v1.ComputeEngineTargetDetails) targetVmDetails_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          targetVmDetails_ = value;
        }
        onChanged();
      } else {
        if (targetVmDetailsCase_ == 14) {
          computeEngineTargetDetailsBuilder_.mergeFrom(value);
        } else {
          computeEngineTargetDetailsBuilder_.setMessage(value);
        }
      }
      targetVmDetailsCase_ = 14;
      return this;
    }
<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