Update rest-api-spec (#5132)

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

Author: github-actions[bot]

output/schema/schema.json

@@ -0,0 +1,31 @@
+{
+  "transform.set_upgrade_mode": {
+    "documentation": {
+      "url": "https://www.elastic.co/guide/en/elasticsearch/reference/current/transform-set-upgrade-mode.html",
+      "description": "Sets a cluster wide upgrade_mode setting that prepares transform indices for an upgrade."
+    },
+    "stability": "stable",
+    "visibility": "public",
+    "headers": {
+      "accept": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/_transform/set_upgrade_mode",
+          "methods": ["POST"]
+        }
+      ]
+    },
+    "params": {
+      "enabled": {
+        "type": "boolean",
+        "description": "Whether to enable upgrade_mode Transform setting or not. Defaults to false."
+      },
+      "timeout": {
+        "type": "time",
+        "description": "Controls the time to wait before action times out. Defaults to 30 seconds"
+      }
+    }
+  }
+}