Update rest-api-spec (#4977)

Co-authored-by: pquentin <[email protected]>

Author: github-actions[bot]

output/schema/validation-errors.json

@@ -2,12 +2,7 @@
   "endpointErrors": {
     "msearch": {
       "request": [
-        "Request: query parameter 'allow_no_indices' does not exist in the json spec",
-        "Request: query parameter 'expand_wildcards' does not exist in the json spec",
-        "Request: query parameter 'ignore_throttled' does not exist in the json spec",
-        "Request: query parameter 'ignore_unavailable' does not exist in the json spec",
-        "Request: query parameter 'include_named_queries_score' does not exist in the json spec",
-        "Request: query parameter 'routing' does not exist in the json spec"
+        "Request: missing json spec query parameter 'index'"
       ],
       "response": []
     }

specification/_json_spec/msearch.json

@@ -60,6 +60,38 @@
         "type": "boolean",
         "description": "Indicates whether network round-trips should be minimized as part of cross-cluster search requests execution",
         "default": "true"
+      },
+      "index": {
+        "type": "list",
+        "description": "A comma-separated list of index names to use as default"
+      },
+      "ignore_unavailable": {
+        "type": "boolean",
+        "description": "Whether specified concrete indices should be ignored when unavailable (missing or closed)"
+      },
+      "ignore_throttled": {
+        "type": "boolean",
+        "description": "Whether specified concrete, expanded or aliased indices should be ignored when throttled",
+        "deprecated": true
+      },
+      "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)"
+      },
+      "expand_wildcards": {
+        "type": "enum",
+        "options": ["open", "closed", "hidden", "none", "all"],
+        "default": "open",
+        "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
+      },
+      "routing": {
+        "type": "list",
+        "description": "A comma-separated list of specific routing values"
+      },
+      "include_named_queries_score": {
+        "type": "boolean",
+        "description": "Indicates whether hit.matched_queries should be rendered as a map that includes the name of the matched query associated with its score (true) or as an array containing the name of the matched queries (false)",
+        "default": false
       }
     },
     "body": {