Fixed indices.open test - need to wait for shards to be allocated

before trying to close the index

rest-api-spec/test/indices.open/10_basic.yaml

@@ -5,10 +5,8 @@
         index: test_index
 
   - do:
-      indices.exists:
+      cluster.health:
-        index: test_index
+        wait_for_status: yellow
-
-  - is_true: ''
 
   - do:
       indices.close: