
admin.groupSetCompressedTreeReadSize( config as element(configuration), group-id as (Number|String), value as Number ) as element(configuration)
      This function changes the compressed tree read size setting
      of the group with the specified ID to the specified value.
      This is a "cold" operation; when you use 
      
      admin.saveConfiguration
	  to save the configuration, it will automatically restart MarkLogic Server.
          
          If the Cache Sizing method is set to automatic (by means of the 
          admin:group-set-cache-sizing function or the Admin UI), 
          this function
          sets the compressed tree read size for the group configuration, but it is
          not used until the Cache Sizing method is set to manual. When 
          the Cache Sizing method is automatic, MarkLogic will set the
          cache size and ignore any manual settings.
          
http://marklogic.com/xdmp/privileges/admin/group
http://marklogic.com/xdmp/privileges/admin/group/{id}
  
  const admin = require('/MarkLogic/admin.xqy');
  const config = admin.getConfiguration()
  const groupid = admin.groupGetId(config, "Default")
  admin.groupSetCompressedTreeReadSize(config, groupid, 256)
   //returns the new configuration element -- use admin.saveConfiguration
   //to save the changes to the configuration or pass the configuration
   //to other Admin API functions to make other changes.  
  
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