diff --git a/x-pack/plugin/src/test/resources/rest-api-spec/test/constant_keyword/10_basic.yml b/x-pack/plugin/src/test/resources/rest-api-spec/test/constant_keyword/10_basic.yml
index 0635de2add5..9bd6e409c65 100644
--- a/x-pack/plugin/src/test/resources/rest-api-spec/test/constant_keyword/10_basic.yml
+++ b/x-pack/plugin/src/test/resources/rest-api-spec/test/constant_keyword/10_basic.yml
@@ -8,6 +8,8 @@ setup:
       indices.create:
         index:  test1
         body:
+          settings:
+            number_of_shards: 1
           mappings:
             properties:
               foo:
@@ -18,6 +20,8 @@ setup:
       indices.create:
         index:  test2
         body:
+          settings:
+            number_of_shards: 1
           mappings:
             properties:
               foo: