Update rest-api-spec

Author: pquentin

output/schema/schema.json

@@ -29,6 +29,16 @@
         "options": ["open", "closed", "hidden", "none", "all"],
         "default": "open",
         "description": "Whether wildcard expressions should get expanded to open or closed indices (default: open)"
+      },
+      "ignore_unavailable": {
+        "type": "boolean",
+        "description": "Whether specified concrete indices should be ignored when unavailable (missing or closed)",
+        "default": false
+      },
+      "allow_no_indices": {
+        "type": "boolean",
+        "description": "Whether to ignore if a wildcard indices expression resolves into no concrete indices. (This includes `_all` string or when no indices have been specified)",
+        "default": true
       }
     }
   }

output/schema/validation-errors.json

@@ -7,8 +7,7 @@
     "stability": "stable",
     "visibility": "public",
     "headers": {
-      "accept": ["application/json"],
-      "content_type": ["application/json"]
+      "accept": ["application/json"]
     },
     "url": {
       "paths": [