ENGCOM-1935: [Backport] ISSUE-11477 - fixed Swagger response for searchCriteria - added zero … #15945

 - Merge Pull Request #15945 from vgelani/magento2:2.1-develop-PR-port-15322
 - Merged commits:
   1. f3108a3

Author: magento-engcom-team

app/code/Magento/Webapi/Model/Rest/Swagger/Generator.php

@@ -39,7 +39,7 @@ class Generator extends AbstractSchemaGenerator
     const UNAUTHORIZED_DESCRIPTION = '401 Unauthorized';
 
     /** Array signifier */
-    const ARRAY_SIGNIFIER = '[]';
+    const ARRAY_SIGNIFIER = '[0]';
 
     /**
      * Swagger factory instance.