Added tests for _refresh. (opensearch-project#374)

Signed-off-by: dblock <[email protected]>

tests/indices/_refresh.yaml

@@ -0,0 +1,34 @@
+$schema: ../../json_schemas/test_story.schema.yaml
+
+description: Test _refresh.
+epilogues:
+  - path: /movies
+    method: DELETE
+    status: [200, 404]
+prologues:
+  - path: /movies/_doc
+    method: POST
+    request_body:
+      payload:
+        title: Beauty and the Beast
+        year: 1991
+    status: [201]
+chapters:
+  - synopsis: Refresh.
+    path: /_refresh
+    method: POST
+    response:
+      status: 200
+  - synopsis: Refresh an index.
+    path: /{index}/_refresh
+    method: POST
+    parameters:
+      index: movies
+      ignore_unavailable: true
+      allow_no_indices: false
+      expand_wildcards: all
+    response:
+      status: 200
+      payload:
+        _shards:
+          failed: 0