
admin.hostGetId( config as element(configuration), host-name as String ) as (Number|String)
		  This function return the ID for the specified host from
		  the configuration.
		  The difference between this function and xdmp:host()
		  is that the ID from
		  this function can come from a host that has not yet been saved (that is,
		  from a host that has been created in the same query with the Admin library
		  but has not yet been saved to the cluster configuration files).  This ID
		  enables you to completely configure a newly created host without the
		  need to first save the configuration.
	  
http://marklogic.com/xdmp/privileges/admin/host
http://marklogic.com/xdmp/privileges/admin/host/{id}
  
  const admin = require('/MarkLogic/admin.xqy');
  const config = admin.getConfiguration()
  admin.hostGetId(config, xdmp.hostName())
   //returns the host ID