public com.google.cloud.vmmigration.v1.AvailableUpdates getAvailableVersions() {
      if (availableVersionsBuilder_ == null) {
        return availableVersions_ == null
            ? com.google.cloud.vmmigration.v1.AvailableUpdates.getDefaultInstance()
            : availableVersions_;
      } else {
        return availableVersionsBuilder_.getMessage();
      }
    }
<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>

@return The availableVersions.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/DatacenterConnector.java