Update rest-api-spec 8.18

output/schema/validation-errors.json

@@ -1,5 +1,16 @@
 {
-  "endpointErrors": {},
+  "endpointErrors": {
+    "cat.segments": {
+      "request": [
+        "Request: missing json spec query parameter 'ignore_unavailable'",
+        "Request: missing json spec query parameter 'ignore_throttled'",
+        "Request: missing json spec query parameter 'allow_no_indices'",
+        "Request: missing json spec query parameter 'expand_wildcards'",
+        "Request: missing json spec query parameter 'allow_closed'"
+      ],
+      "response": []
+    }
+  },
   "generalErrors": [
     "Dangling type '_global.scripts_painless_execute:PainlessExecutionPosition'",
     "Dangling type '_global.scripts_painless_execute:PainlessScript'",

specification/_json_spec/cat.segments.json

@@ -62,6 +62,29 @@
         "type": "boolean",
         "description": "Verbose mode. Display column headers",
         "default": false
+      },
+      "ignore_unavailable": {
+        "type": "boolean",
+        "description": "Whether specified concrete indices should be ignored when unavailable (missing or closed). Only allowed when providing an index expression."
+      },
+      "ignore_throttled": {
+        "type": "boolean",
+        "description": "Whether specified concrete, expanded or aliased indices should be ignored when throttled. Only allowed when providing an index expression."
+      },
+      "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). Only allowed when providing an index expression."
+      },
+      "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."
+      },
+      "allow_closed": {
+        "type": "boolean",
+        "description": "If true, allow closed indices to be returned in the response otherwise if false, keep the legacy behaviour of throwing an exception if index pattern matches closed indices",
+        "default": false
       }
     }
   }