private JSONObject getConfigurationFromAmbari(String versionTag) throws AmbariHttpException {
    String url = String.format(CONFIGURATION_URL_BY_TAG, versionTag);
    JSONObject responseJSON = readFromCluster(url);
    return  responseJSON;
  }
Checks if the user is an operator.

@return    if <code>true</code>, the user is an operator; otherwise <code>false</code>
contrib/views/capacity-scheduler/src/main/java/org/apache/ambari/view/capacityscheduler/ConfigurationService.java