[esvm] do not set now invalid setting "script.indexed" in 5.0

grunt/config/esvm.js

@@ -60,11 +60,16 @@ var versionedOpts = [
       'node.attr.testattr': 'test'
     }
   },
+  {
+    version: '>=1.6 <5.0',
+    config: {
+      'script.indexed': true
+    }
+  },
   {
     version: '>=1.6',
     config: {
       'script.inline': true,
-      'script.indexed': true,
       'path.repo': process.env.ES_PATH_REPO || fromRoot('.es-snapshot-repos'),
       'repositories.url.allowed_urls': 'http://snapshot.*'
     }