This is a piece of code from JQMIGRATE responsible for warning
// Turn global events into document-triggered events
jQuery.event.trigger = function( event, data, elem, onlyHandlers ){
if ( !elem && !rajaxEvent.test( event ) ) {
migrateWarn( "Global events are undocumented and deprecated" );
}
return eventTrigger.call( this, event, data, elem || document, onlyHandlers );
};
Looks like this warning is popping on trigger() calls in two cases:
1) no element is specified as trigger context
2) event is global ajax event
Global ajax event example:
$(document).bind("ajaxSend", function(){
$("#loading").show();
}).bind("ajaxComplete", function(){
$("#loading").hide();
});
But if you say you had disabled global events by setting jQuery.ajaxSetup({global: false}), then problem could be caused by case 1, but i dont see any code releavant to it in the provided fragment.
Probably you need to check implementation of method successCallback for case 1.