diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index d23f7e9c9b..5ff43d9639 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -86070,12 +86070,12 @@
           "peak_throughput_per_minute": {
             "type": "number"
           },
-          "rejection_execution_count": {
+          "rejected_execution_count": {
             "description": "The number of inference requests that were not processed because the queue was full.",
             "type": "number"
           },
           "routing_state": {
-            "$ref": "#/components/schemas/ml._types:TrainedModelAssignmentRoutingTable"
+            "$ref": "#/components/schemas/ml._types:TrainedModelAssignmentRoutingStateAndReason"
           },
           "start_time": {
             "$ref": "#/components/schemas/_types:EpochTimeUnitMillis"
@@ -86098,7 +86098,7 @@
           "throughput_last_minute"
         ]
       },
-      "ml._types:TrainedModelAssignmentRoutingTable": {
+      "ml._types:TrainedModelAssignmentRoutingStateAndReason": {
         "type": "object",
         "properties": {
           "reason": {
@@ -86107,20 +86107,10 @@
           },
           "routing_state": {
             "$ref": "#/components/schemas/ml._types:RoutingState"
-          },
-          "current_allocations": {
-            "description": "Current number of allocations.",
-            "type": "number"
-          },
-          "target_allocations": {
-            "description": "Target number of allocations.",
-            "type": "number"
           }
         },
         "required": [
-          "routing_state",
-          "current_allocations",
-          "target_allocations"
+          "routing_state"
         ]
       },
       "ml._types:RoutingState": {
@@ -87193,6 +87183,31 @@
           "task_parameters"
         ]
       },
+      "ml._types:TrainedModelAssignmentRoutingTable": {
+        "type": "object",
+        "properties": {
+          "reason": {
+            "description": "The reason for the current state. It is usually populated only when the\n`routing_state` is `failed`.",
+            "type": "string"
+          },
+          "routing_state": {
+            "$ref": "#/components/schemas/ml._types:RoutingState"
+          },
+          "current_allocations": {
+            "description": "Current number of allocations.",
+            "type": "number"
+          },
+          "target_allocations": {
+            "description": "Target number of allocations.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "routing_state",
+          "current_allocations",
+          "target_allocations"
+        ]
+      },
       "ml._types:TrainedModelAssignmentTaskParameters": {
         "type": "object",
         "properties": {
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 19e01d82de..e4c98d30db 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -56082,12 +56082,12 @@
           "peak_throughput_per_minute": {
             "type": "number"
           },
-          "rejection_execution_count": {
+          "rejected_execution_count": {
             "description": "The number of inference requests that were not processed because the queue was full.",
             "type": "number"
           },
           "routing_state": {
-            "$ref": "#/components/schemas/ml._types:TrainedModelAssignmentRoutingTable"
+            "$ref": "#/components/schemas/ml._types:TrainedModelAssignmentRoutingStateAndReason"
           },
           "start_time": {
             "$ref": "#/components/schemas/_types:EpochTimeUnitMillis"
@@ -56110,7 +56110,7 @@
           "throughput_last_minute"
         ]
       },
-      "ml._types:TrainedModelAssignmentRoutingTable": {
+      "ml._types:TrainedModelAssignmentRoutingStateAndReason": {
         "type": "object",
         "properties": {
           "reason": {
@@ -56119,20 +56119,10 @@
           },
           "routing_state": {
             "$ref": "#/components/schemas/ml._types:RoutingState"
-          },
-          "current_allocations": {
-            "description": "Current number of allocations.",
-            "type": "number"
-          },
-          "target_allocations": {
-            "description": "Target number of allocations.",
-            "type": "number"
           }
         },
         "required": [
-          "routing_state",
-          "current_allocations",
-          "target_allocations"
+          "routing_state"
         ]
       },
       "ml._types:RoutingState": {
@@ -57127,6 +57117,31 @@
           "task_parameters"
         ]
       },
+      "ml._types:TrainedModelAssignmentRoutingTable": {
+        "type": "object",
+        "properties": {
+          "reason": {
+            "description": "The reason for the current state. It is usually populated only when the\n`routing_state` is `failed`.",
+            "type": "string"
+          },
+          "routing_state": {
+            "$ref": "#/components/schemas/ml._types:RoutingState"
+          },
+          "current_allocations": {
+            "description": "Current number of allocations.",
+            "type": "number"
+          },
+          "target_allocations": {
+            "description": "Target number of allocations.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "routing_state",
+          "current_allocations",
+          "target_allocations"
+        ]
+      },
       "ml._types:TrainedModelAssignmentTaskParameters": {
         "type": "object",
         "properties": {
diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index 1d02dd3795..5c05799ff0 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -138924,7 +138924,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L487-L496"
+      "specLocation": "ml/_types/TrainedModel.ts#L499-L508"
     },
     {
       "kind": "interface",
@@ -138945,7 +138945,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L479-L481"
+      "specLocation": "ml/_types/TrainedModel.ts#L491-L493"
     },
     {
       "kind": "interface",
@@ -138966,7 +138966,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L483-L485"
+      "specLocation": "ml/_types/TrainedModel.ts#L495-L497"
     },
     {
       "kind": "interface",
@@ -139383,7 +139383,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L451-L458"
+      "specLocation": "ml/_types/TrainedModel.ts#L463-L470"
     },
     {
       "kind": "interface",
@@ -139558,7 +139558,7 @@
         },
         {
           "description": "The number of inference requests that were not processed because the queue was full.",
-          "name": "rejection_execution_count",
+          "name": "rejected_execution_count",
           "required": false,
           "type": {
             "kind": "instance_of",
@@ -139575,7 +139575,7 @@
           "type": {
             "kind": "instance_of",
             "type": {
-              "name": "TrainedModelAssignmentRoutingTable",
+              "name": "TrainedModelAssignmentRoutingStateAndReason",
               "namespace": "ml._types"
             }
           }
@@ -139642,7 +139642,7 @@
     {
       "kind": "interface",
       "name": {
-        "name": "TrainedModelAssignmentRoutingTable",
+        "name": "TrainedModelAssignmentRoutingStateAndReason",
         "namespace": "ml._types"
       },
       "properties": [
@@ -139669,33 +139669,9 @@
               "namespace": "ml._types"
             }
           }
-        },
-        {
-          "description": "Current number of allocations.",
-          "name": "current_allocations",
-          "required": true,
-          "type": {
-            "kind": "instance_of",
-            "type": {
-              "name": "integer",
-              "namespace": "_types"
-            }
-          }
-        },
-        {
-          "description": "Target number of allocations.",
-          "name": "target_allocations",
-          "required": true,
-          "type": {
-            "kind": "instance_of",
-            "type": {
-              "name": "integer",
-              "namespace": "_types"
-            }
-          }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L431-L449"
+      "specLocation": "ml/_types/TrainedModel.ts#L431-L441"
     },
     {
       "kind": "interface",
@@ -142262,7 +142238,65 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L460-L477"
+      "specLocation": "ml/_types/TrainedModel.ts#L472-L489"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "TrainedModelAssignmentRoutingTable",
+        "namespace": "ml._types"
+      },
+      "properties": [
+        {
+          "description": "The reason for the current state. It is usually populated only when the\n`routing_state` is `failed`.",
+          "name": "reason",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "description": "The current routing state.",
+          "name": "routing_state",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "RoutingState",
+              "namespace": "ml._types"
+            }
+          }
+        },
+        {
+          "description": "Current number of allocations.",
+          "name": "current_allocations",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        },
+        {
+          "description": "Target number of allocations.",
+          "name": "target_allocations",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "integer",
+              "namespace": "_types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ml/_types/TrainedModel.ts#L443-L461"
     },
     {
       "kind": "interface",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 2d6a186fa7..e6e9a7ea00 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -175530,7 +175530,41 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L460-L477"
+      "specLocation": "ml/_types/TrainedModel.ts#L472-L489"
+    },
+    {
+      "kind": "interface",
+      "name": {
+        "name": "TrainedModelAssignmentRoutingStateAndReason",
+        "namespace": "ml._types"
+      },
+      "properties": [
+        {
+          "description": "The reason for the current state. It is usually populated only when the\n`routing_state` is `failed`.",
+          "name": "reason",
+          "required": false,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
+          }
+        },
+        {
+          "description": "The current routing state.",
+          "name": "routing_state",
+          "required": true,
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "RoutingState",
+              "namespace": "ml._types"
+            }
+          }
+        }
+      ],
+      "specLocation": "ml/_types/TrainedModel.ts#L431-L441"
     },
     {
       "kind": "interface",
@@ -175588,7 +175622,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L431-L449"
+      "specLocation": "ml/_types/TrainedModel.ts#L443-L461"
     },
     {
       "kind": "interface",
@@ -176139,7 +176173,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L451-L458"
+      "specLocation": "ml/_types/TrainedModel.ts#L463-L470"
     },
     {
       "kind": "interface",
@@ -176329,7 +176363,7 @@
         },
         {
           "description": "The number of inference requests that were not processed because the queue was full.",
-          "name": "rejection_execution_count",
+          "name": "rejected_execution_count",
           "required": false,
           "type": {
             "kind": "instance_of",
@@ -176346,7 +176380,7 @@
           "type": {
             "kind": "instance_of",
             "type": {
-              "name": "TrainedModelAssignmentRoutingTable",
+              "name": "TrainedModelAssignmentRoutingStateAndReason",
               "namespace": "ml._types"
             }
           }
@@ -176887,7 +176921,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L479-L481"
+      "specLocation": "ml/_types/TrainedModel.ts#L491-L493"
     },
     {
       "kind": "interface",
@@ -176908,7 +176942,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L483-L485"
+      "specLocation": "ml/_types/TrainedModel.ts#L495-L497"
     },
     {
       "kind": "interface",
@@ -176942,7 +176976,7 @@
           }
         }
       ],
-      "specLocation": "ml/_types/TrainedModel.ts#L487-L496"
+      "specLocation": "ml/_types/TrainedModel.ts#L499-L508"
     },
     {
       "kind": "interface",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index c7f14ab89f..ddcf19ff1a 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -15796,6 +15796,11 @@ export interface MlTrainedModelAssignment {
   task_parameters: MlTrainedModelAssignmentTaskParameters
 }
 
+export interface MlTrainedModelAssignmentRoutingStateAndReason {
+  reason?: string
+  routing_state: MlRoutingState
+}
+
 export interface MlTrainedModelAssignmentRoutingTable {
   reason?: string
   routing_state: MlRoutingState
@@ -15870,8 +15875,8 @@ export interface MlTrainedModelDeploymentNodesStats {
   number_of_allocations?: integer
   number_of_pending_requests?: integer
   peak_throughput_per_minute: long
-  rejection_execution_count?: integer
-  routing_state: MlTrainedModelAssignmentRoutingTable
+  rejected_execution_count?: integer
+  routing_state: MlTrainedModelAssignmentRoutingStateAndReason
   start_time?: EpochTime<UnitMillis>
   threads_per_allocation?: integer
   throughput_last_minute: integer
diff --git a/specification/ml/_types/TrainedModel.ts b/specification/ml/_types/TrainedModel.ts
index acc7fe5c4f..1c48b362f1 100644
--- a/specification/ml/_types/TrainedModel.ts
+++ b/specification/ml/_types/TrainedModel.ts
@@ -187,9 +187,9 @@ export class TrainedModelDeploymentNodesStats {
 
   peak_throughput_per_minute: long
   /** The number of inference requests that were not processed because the queue was full. */
-  rejection_execution_count?: integer
+  rejected_execution_count?: integer
   /** The current routing state and reason for the current routing state for this allocation. */
-  routing_state: TrainedModelAssignmentRoutingTable
+  routing_state: TrainedModelAssignmentRoutingStateAndReason
   /** The epoch timestamp when the allocation started. */
   start_time?: EpochTime<UnitMillis>
   /** The number of threads used by each allocation during inference. */
@@ -428,6 +428,18 @@ export enum RoutingState {
   stopping
 }
 
+export class TrainedModelAssignmentRoutingStateAndReason {
+  /**
+   * The reason for the current state. It is usually populated only when the
+   * `routing_state` is `failed`.
+   */
+  reason?: string
+  /**
+   * The current routing state.
+   */
+  routing_state: RoutingState
+}
+
 export class TrainedModelAssignmentRoutingTable {
   /**
    * The reason for the current state. It is usually populated only when the