Deleted REST test pending shard header

Bug introduced in #10162

rest-api-spec/test/index/12_shard_header_pending.yaml

@@ -1,33 +0,0 @@
----
-"Index check shard header pending field":
-
- - skip:
-      features:    "requires_replica"
-
- - do:
-      indices.create:
-        index: foobar
-        body:
-          settings:
-            number_of_shards: "1"
-            number_of_replicas: "1"
-
- - do:
-      cluster.health:
-          wait_for_status: green
-
- - do:
-      index:
-          index:  foobar
-          type:   baz
-          id:     1
-          body:   { foo: bar }
-
- - match:   { _index:   foobar }
- - match:   { _type:    baz }
- - match:   { _id:      "1"}
- - match:   { _version: 1}
- - match:   { _shards.total: 2}
- - match:   { _shards.successful: 1}
- - match:   { _shards.failed: 0}
- - match:   { _shards.pending: 1}