merge magento/2.3-develop into magento-performance/MC-4244-PR

Author: magento-cicd2

app/code/Magento/AdvancedSearch/view/adminhtml/web/js/testconnection.js

@@ -40,7 +40,8 @@ define([
                 element =  $('#' + this.options.elementId),
                 self = this,
                 params = {},
-                msg = '';
+                msg = '',
+                fieldToCheck = this.options.fieldToCheck || 'success';
 
             element.removeClass('success').addClass('fail');
             $.each($.parseJSON(this.options.fieldMapping), function (key, el) {
@@ -49,9 +50,10 @@ define([
             $.ajax({
                 url: this.options.url,
                 showLoader: true,
-                data: params
+                data: params,
+                headers: this.options.headers || {}
             }).done(function (response) {
-                if (response.success) {
+                if (response[fieldToCheck]) {
                     element.removeClass('fail').addClass('success');
                     result = self.options.successText;
                 } else {