diff --git a/output/schema/schema.json b/output/schema/schema.json
index 01ab848c46..c379438bc7 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -9669,6 +9669,34 @@
         }
       ]
     },
+    {
+      "availability": {
+        "stack": {
+          "stability": "stable",
+          "visibility": "public"
+        }
+      },
+      "description": "Configure a custom inference endpoint",
+      "docUrl": "https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-inference-put-custom",
+      "name": "inference.put_custom",
+      "request": null,
+      "requestBodyRequired": false,
+      "requestMediaType": [
+        "application/json"
+      ],
+      "response": null,
+      "responseMediaType": [
+        "application/json"
+      ],
+      "urls": [
+        {
+          "methods": [
+            "PUT"
+          ],
+          "path": "/_inference/{task_type}/{custom_inference_id}"
+        }
+      ]
+    },
     {
       "availability": {
         "serverless": {
diff --git a/output/schema/validation-errors.json b/output/schema/validation-errors.json
index 127b19c115..e895f430af 100644
--- a/output/schema/validation-errors.json
+++ b/output/schema/validation-errors.json
@@ -6,12 +6,6 @@
       ],
       "response": []
     },
-    "esql.async_query_get": {
-      "request": [
-        "Request: query parameter 'format' does not exist in the json spec"
-      ],
-      "response": []
-    },
     "ml.stop_datafeed": {
       "request": [
         "Request: missing json spec query parameter 'allow_no_datafeeds'"
diff --git a/specification/_json_spec/esql.async_query_get.json b/specification/_json_spec/esql.async_query_get.json
index b2b4b17ccc..f92bce11c9 100644
--- a/specification/_json_spec/esql.async_query_get.json
+++ b/specification/_json_spec/esql.async_query_get.json
@@ -24,6 +24,10 @@
       ]
     },
     "params": {
+      "format": {
+        "type": "string",
+        "description": "a short version of the Accept header, e.g. json, yaml"
+      },
       "wait_for_completion_timeout": {
         "type": "time",
         "description": "Specify the time that the request should block waiting for the final response"
diff --git a/specification/_json_spec/inference.put_custom.json b/specification/_json_spec/inference.put_custom.json
new file mode 100644
index 0000000000..c12108683d
--- /dev/null
+++ b/specification/_json_spec/inference.put_custom.json
@@ -0,0 +1,35 @@
+{
+  "inference.put_custom": {
+    "documentation": {
+      "url": "https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-inference-put-custom",
+      "description": "Configure a custom inference endpoint"
+    },
+    "stability": "stable",
+    "visibility": "public",
+    "headers": {
+      "accept": ["application/json"],
+      "content_type": ["application/json"]
+    },
+    "url": {
+      "paths": [
+        {
+          "path": "/_inference/{task_type}/{custom_inference_id}",
+          "methods": ["PUT"],
+          "parts": {
+            "task_type": {
+              "type": "string",
+              "description": "The task type"
+            },
+            "custom_inference_id": {
+              "type": "string",
+              "description": "The inference Id"
+            }
+          }
+        }
+      ]
+    },
+    "body": {
+      "description": "The inference endpoint's task and service settings"
+    }
+  }
+}