function _fnAjaxUpdate(settings) {
		settings.iDraw++;
		_fnProcessingDisplay(settings, true);

		_fnBuildAjax(
			settings,
			_fnAjaxParameters(settings),
			function (json) {
				_fnAjaxUpdateDraw(settings, json);
			}
		);
	}
Update the table using an Ajax call
 @param {object} settings dataTables settings object
 @returns {boolean} Block the table drawing or not
 @memberof DataTable#oApi