Merge pull request #1004 from tylerjl/fix-7.0-template-tests

Remove _default_ mapping for type deprecations

Author: tylerjl

spec/fixtures/templates/post_6.0.json

@@ -15,7 +15,7 @@
     }
   },
   "mappings": {
-    "_default_": {
+    "_doc": {
       "dynamic_templates": [
         {
           "string_fields": {