[TEST] Create the index with `number_of_replicas: 0` for "Realtime Refresh" tests

rest-api-spec/test/exists/60_realtime_refresh.yaml

@@ -2,11 +2,13 @@
 "Realtime Refresh":
 
  - do:
-      indices.create:
-          index:    test_1
-          body:
-              settings:
-                  index.refresh_interval: -1
+     indices.create:
+       index:    test_1
+       body:
+         settings:
+           index:
+             refresh_interval: -1
+             number_of_replicas: 0
  - do:
       cluster.health:
           wait_for_status: yellow

rest-api-spec/test/get/60_realtime_refresh.yaml

@@ -1,12 +1,15 @@
 ---
 "Realtime Refresh":
 
- - do:
+  - do:
       indices.create:
-          index:    test_1
-          body:
-              settings:
-                  index.refresh_interval: -1
+        index:    test_1
+        body:
+          settings:
+            index:
+              refresh_interval: -1
+              number_of_replicas: 0
+
  - do:
       cluster.health:
           wait_for_status: yellow

rest-api-spec/test/mget/60_realtime_refresh.yaml

@@ -1,12 +1,15 @@
 ---
 "Realtime Refresh":
 
- - do:
+  - do:
       indices.create:
-          index:    test_1
-          body:
-              settings:
-                  index.refresh_interval: -1
+        index:    test_1
+        body:
+          settings:
+            index:
+              refresh_interval: -1
+              number_of_replicas: 0
+
  - do:
       cluster.health:
           wait_for_status: yellow