ENGCOM-1887: ISSUE-11477 - fixed Swagger response for searchCriteria #15322

 - Merge Pull Request #15322 from idziakjakub/magento2:fix-searchcriteria-swagger
 - Merged commits:
   1. 788485a

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.