private ExtensionVersionRequest getRequest(Map<String, Object> properties) {
    return new ExtensionVersionRequest(
        (String) properties.get(EXTENSION_NAME_PROPERTY_ID),
        (String) properties.get(EXTENSION_VERSION_PROPERTY_ID));
  }
The property ids for a ExtensionVersion resource.
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/ExtensionVersionResourceProvider.java