Fixes date_hierachy tests for 6.8

Author: Clément Tourrière

src/test/resources/rest-api-spec/test/PathHierarchy/30_date_hierarchy.yml

@@ -7,9 +7,10 @@ setup:
             number_of_shards: 2
             number_of_replicas: 0
           mappings:
-            properties:
-              date:
-                type: date
+            _doc:
+              properties:
+                date:
+                  type: date
 
   - do:
       cluster.health:
@@ -20,18 +21,21 @@ setup:
   - do:
       index:
         index: calendar
+        type: _doc
         id: 1
         body: { "date": "2012-01-10T02:47:28" }
 
   - do:
       index:
         index: calendar
+        type: _doc
         id: 2
         body: { "date": "2011-01-05T01:43:35" }
 
   - do:
       index:
         index: calendar
+        type: _doc
         id: 3
         body: { "date": "2012-05-01T12:24:19" }
 
@@ -42,7 +46,6 @@ setup:
 # test years interval
   - do:
       search:
-        rest_total_hits_as_int: true
         body: {
           "size" : 0,
           "aggs" : {
@@ -68,7 +71,6 @@ setup:
 # test months interval
   - do:
       search:
-        rest_total_hits_as_int: true
         body: {
           "size": 0,
           "aggs": {