code: public boolean removeHadoopClusterServerInformation(final String serverName) {
          final Element serverInformationCatalogElement = getServerInformationCatalogElement();
          final Element hadoopClustersElement =
                  getOrCreateChildElementByTagName(serverInformationCatalogElement, "hadoop-clusters");
          return removeChildElementByNameAttribute(serverName, hadoopClustersElement);
      }
docs: Removes a Hadoop cluster by its name, if it exists and is recognizeable by the externalizer.
  
  @param serverName
  @return true if a server information element was removed from the XML document.