changeQueryCSWP.js

var showDocs = function() {
    var qGroups = Srch.ScriptApplicationManager.get_current().queryGroups;
    $.each(qGroups, function() {
        if (this.displays != null && this.displays.length > 0) {
        	// Result source GUID
            this.dataProvider.set_sourceID('70949b02-0f2c-4026-9c4f-c9d6e0023aa4');
            this.dataProvider.issueQuery();
        }
    });
};