diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 8b9f826254..7d902c3261 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -66625,6 +66625,19 @@
               }
             ]
           },
+          "dataset.size": {
+            "description": "total size of dataset (includes the cache for partially mounted indices)",
+            "x-available-since": "8.11.0",
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "nullable": true,
+                "type": "string"
+              }
+            ]
+          },
           "completion.size": {
             "description": "size of completion",
             "type": "string"
@@ -68656,6 +68669,19 @@
               }
             ]
           },
+          "dataset": {
+            "description": "total size of dataset (includes the cache for partially mounted indices)",
+            "x-available-since": "8.11.0",
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "nullable": true,
+                "type": "string"
+              }
+            ]
+          },
           "ip": {
             "description": "The IP address of the node.",
             "oneOf": [
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index 869fa13311..18d6c6835d 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -42533,6 +42533,19 @@
               }
             ]
           },
+          "dataset.size": {
+            "description": "total size of dataset (includes the cache for partially mounted indices)",
+            "x-available-since": "8.11.0",
+            "oneOf": [
+              {
+                "type": "string"
+              },
+              {
+                "nullable": true,
+                "type": "string"
+              }
+            ]
+          },
           "completion.size": {
             "description": "size of completion",
             "type": "string"
diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index 754e17113d..da1f685541 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -105426,6 +105426,40 @@
             "kind": "union_of"
           }
         },
+        {
+          "availability": {
+            "serverless": {
+              "stability": "stable",
+              "visibility": "public"
+            },
+            "stack": {
+              "since": "8.11.0",
+              "stability": "stable"
+            }
+          },
+          "description": "total size of dataset (includes the cache for partially mounted indices)",
+          "name": "dataset.size",
+          "required": false,
+          "type": {
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "string",
+                  "namespace": "_builtins"
+                }
+              },
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "null",
+                  "namespace": "_builtins"
+                }
+              }
+            ],
+            "kind": "union_of"
+          }
+        },
         {
           "aliases": [
             "cs",
@@ -107232,7 +107266,7 @@
           }
         }
       ],
-      "specLocation": "cat/indices/types.ts#L20-L801"
+      "specLocation": "cat/indices/types.ts#L20-L808"
     },
     {
       "kind": "interface",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 491848742c..caf0c16488 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -89664,6 +89664,40 @@
             ]
           }
         },
+        {
+          "availability": {
+            "serverless": {
+              "stability": "stable",
+              "visibility": "public"
+            },
+            "stack": {
+              "since": "8.11.0",
+              "stability": "stable"
+            }
+          },
+          "description": "total size of dataset (includes the cache for partially mounted indices)",
+          "name": "dataset.size",
+          "required": false,
+          "type": {
+            "kind": "union_of",
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "string",
+                  "namespace": "_builtins"
+                }
+              },
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "null",
+                  "namespace": "_builtins"
+                }
+              }
+            ]
+          }
+        },
         {
           "aliases": [
             "cs",
@@ -91470,7 +91504,7 @@
           }
         }
       ],
-      "specLocation": "cat/indices/types.ts#L20-L801"
+      "specLocation": "cat/indices/types.ts#L20-L808"
     },
     {
       "kind": "request",
@@ -97038,6 +97072,40 @@
             ]
           }
         },
+        {
+          "availability": {
+            "serverless": {
+              "stability": "stable",
+              "visibility": "public"
+            },
+            "stack": {
+              "since": "8.11.0",
+              "stability": "stable"
+            }
+          },
+          "description": "total size of dataset (includes the cache for partially mounted indices)",
+          "name": "dataset",
+          "required": false,
+          "type": {
+            "kind": "union_of",
+            "items": [
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "string",
+                  "namespace": "_builtins"
+                }
+              },
+              {
+                "kind": "instance_of",
+                "type": {
+                  "name": "null",
+                  "namespace": "_builtins"
+                }
+              }
+            ]
+          }
+        },
         {
           "description": "The IP address of the node.",
           "name": "ip",
@@ -98157,7 +98225,7 @@
           }
         }
       ],
-      "specLocation": "cat/shards/types.ts#L20-L421"
+      "specLocation": "cat/shards/types.ts#L20-L427"
     },
     {
       "kind": "request",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 562aee254f..b7da48ce63 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -6964,6 +6964,7 @@ export interface CatIndicesIndicesRecord {
   ss?: string | null
   storeSize?: string | null
   'pri.store.size'?: string | null
+  'dataset.size'?: string | null
   'completion.size'?: string
   cs?: string
   completionSize?: string
@@ -8081,6 +8082,7 @@ export interface CatShardsShardsRecord {
   dc?: string | null
   store?: string | null
   sto?: string | null
+  dataset?: string | null
   ip?: string | null
   id?: string
   node?: string | null
diff --git a/specification/cat/indices/types.ts b/specification/cat/indices/types.ts
index afb6b6fcfc..c47cdc13ad 100644
--- a/specification/cat/indices/types.ts
+++ b/specification/cat/indices/types.ts
@@ -89,6 +89,13 @@ export class IndicesRecord {
    */
   'pri.store.size'?: string | null
 
+  /**
+   * total size of dataset (including the cache for partially mounted indices)
+   * @availability stack since=8.11.0 stability=stable
+   * @availability serverless stability=stable visibility=public
+   */
+  'dataset.size'?: string | null
+
   /**
    * size of completion
    * @aliases cs,completionSize
diff --git a/specification/cat/shards/types.ts b/specification/cat/shards/types.ts
index 666e271559..4586fe1cc2 100644
--- a/specification/cat/shards/types.ts
+++ b/specification/cat/shards/types.ts
@@ -53,6 +53,12 @@ export class ShardsRecord {
    * @aliases sto
    */
   'store'?: string | null
+  /**
+   * total size of dataset (including the cache for partially mounted indices)
+   * @availability stack since=8.11.0 stability=stable
+   * @availability serverless stability=stable visibility=public
+   */
+  'dataset'?: string | null
   /**
    * The IP address of the node.
    */