diff --git a/rest-api-spec/src/main/resources/rest-api-spec/test/search/400_combined_fields.yml b/rest-api-spec/src/main/resources/rest-api-spec/test/search/400_combined_fields.yml
index e54f7fc9c12bb..f5f0617eb0779 100644
--- a/rest-api-spec/src/main/resources/rest-api-spec/test/search/400_combined_fields.yml
+++ b/rest-api-spec/src/main/resources/rest-api-spec/test/search/400_combined_fields.yml
@@ -3,6 +3,8 @@ setup:
       indices.create:
         index: cf_test
         body:
+          settings:
+            number_of_shards: 1
           mappings:
             properties:
               headline: