public Builder setAvailableVersions(com.google.cloud.vmmigration.v1.AvailableUpdates value) {
      if (availableVersionsBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        availableVersions_ = value;
      } else {
        availableVersionsBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00001000;
      onChanged();
      return this;
    }
<pre>
Output only. The available versions for updating this appliance.
</pre>

<code>
.google.cloud.vmmigration.v1.AvailableUpdates available_versions = 15 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/DatacenterConnector.java