diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 8523b144b0..2ba997a8d5 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -35630,9 +35630,6 @@
                       }
                     ]
                   },
-                  "size": {
-                    "type": "number"
-                  },
                   "source": {
                     "description": "The source you are copying from.",
                     "allOf": [
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index a26c2651a9..2963246808 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -22594,9 +22594,6 @@
                       }
                     ]
                   },
-                  "size": {
-                    "type": "number"
-                  },
                   "source": {
                     "description": "The source you are copying from.",
                     "allOf": [
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 90664b01d5..4ceee0d987 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -35873,17 +35873,6 @@
               }
             }
           },
-          {
-            "name": "size",
-            "required": false,
-            "type": {
-              "kind": "instance_of",
-              "type": {
-                "name": "long",
-                "namespace": "_types"
-              }
-            }
-          },
           {
             "description": "The source you are copying from.",
             "name": "source",
@@ -36400,7 +36389,7 @@
           }
         }
       ],
-      "specLocation": "_global/reindex/ReindexRequest.ts#L27-L318"
+      "specLocation": "_global/reindex/ReindexRequest.ts#L27-L317"
     },
     {
       "kind": "response",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 88ad2f388b..152b6596d2 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -1061,7 +1061,6 @@ export interface ReindexRequest extends RequestBase {
     dest: ReindexDestination
     max_docs?: long
     script?: Script | string
-    size?: long
     source: ReindexSource
   }
 }
diff --git a/specification/_global/reindex/ReindexRequest.ts b/specification/_global/reindex/ReindexRequest.ts
index 3b1f45d6c4..b5b38975a9 100644
--- a/specification/_global/reindex/ReindexRequest.ts
+++ b/specification/_global/reindex/ReindexRequest.ts
@@ -309,7 +309,6 @@ export interface Request extends RequestBase {
      * The script to run to update the document source or metadata when reindexing.
      */
     script?: Script
-    size?: long
     /**
      * The source you are copying from.
      */