diff --git a/compiler/src/steps/validate-model.ts b/compiler/src/steps/validate-model.ts
index 4e661ac94f..fa3fd581cf 100644
--- a/compiler/src/steps/validate-model.ts
+++ b/compiler/src/steps/validate-model.ts
@@ -173,10 +173,7 @@ export default async function validateModel (apiModel: model.Model, restSpec: Ma
 
   const additionalRoots: TypeName[] = [
     // ErrorResponse is not referenced anywhere, but any API could return it if an error happens.
-    { namespace: '_types', name: 'ErrorResponseBase' },
-    // ESQL base versions are pseudo-constants
-    { namespace: 'esql._types', name: 'BaseStatefulEsqlVersion' },
-    { namespace: 'esql._types', name: 'BaseServerlessEsqlVersion' }
+    { namespace: '_types', name: 'ErrorResponseBase' }
   ]
   additionalRoots.forEach(t => validateTypeRef(t, undefined, new Set()))
 
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 1a458844c5..bb4ebe884a 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -112546,47 +112546,6 @@
       },
       "specLocation": "eql/search/types.ts#L20-L32"
     },
-    {
-      "description": "Version of the ES|QL language that should be used by default in serverless client libraries.\n\nThis value is guaranteed to be stable for a given value of the Serverless API version, even if newer versions\nof the ES|QL language are added within that API version.",
-      "kind": "type_alias",
-      "name": {
-        "name": "BaseServerlessEsqlVersion",
-        "namespace": "esql._types"
-      },
-      "specLocation": "esql/_types/EsqlVersion.ts#L42-L48",
-      "type": {
-        "kind": "literal_value",
-        "value": "2024.04.01"
-      }
-    },
-    {
-      "description": "Version of the ES|QL language that should be used by default in stateful client libraries.\n\nThis value is guaranteed to be stable within a major version of the Elastic Stack, even if newer versions\nof the ES|QL language are added within that major version.",
-      "kind": "type_alias",
-      "name": {
-        "name": "BaseStatefulEsqlVersion",
-        "namespace": "esql._types"
-      },
-      "specLocation": "esql/_types/EsqlVersion.ts#L34-L40",
-      "type": {
-        "kind": "literal_value",
-        "value": "2024.04.01"
-      }
-    },
-    {
-      "kind": "enum",
-      "members": [
-        {
-          "codegenName": "V2024_04_01",
-          "description": "Run against the first version of ES|QL.",
-          "name": "2024.04.01"
-        }
-      ],
-      "name": {
-        "name": "EsqlVersion",
-        "namespace": "esql._types"
-      },
-      "specLocation": "esql/_types/EsqlVersion.ts#L20-L29"
-    },
     {
       "attachedBehaviors": [
         "CommonQueryParameters"
@@ -112657,18 +112616,6 @@
                 "namespace": "_builtins"
               }
             }
-          },
-          {
-            "description": "The version of the ES|QL language in which the \"query\" field was written.",
-            "name": "version",
-            "required": true,
-            "type": {
-              "kind": "instance_of",
-              "type": {
-                "name": "EsqlVersion",
-                "namespace": "esql._types"
-              }
-            }
           }
         ]
       },
@@ -112711,7 +112658,7 @@
           }
         }
       ],
-      "specLocation": "esql/query/QueryRequest.ts#L25-L69"
+      "specLocation": "esql/query/QueryRequest.ts#L24-L64"
     },
     {
       "body": {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index a190d92afe..ce34c4914b 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -9827,12 +9827,6 @@ export type EqlSearchResponse<TEvent = unknown> = EqlEqlSearchResponseBase<TEven
 
 export type EqlSearchResultPosition = 'tail' | 'head'
 
-export type EsqlBaseServerlessEsqlVersion = '2024.04.01'
-
-export type EsqlBaseStatefulEsqlVersion = '2024.04.01'
-
-export type EsqlEsqlVersion = '2024.04.01'
-
 export interface EsqlQueryRequest extends RequestBase {
   format?: string
   delimiter?: string
@@ -9842,7 +9836,6 @@ export interface EsqlQueryRequest extends RequestBase {
     locale?: string
     params?: ScalarValue[]
     query: string
-    version: EsqlEsqlVersion
   }
 }
 
diff --git a/specification/esql/_types/EsqlVersion.ts b/specification/esql/_types/EsqlVersion.ts
deleted file mode 100644
index f8e3a9658f..0000000000
--- a/specification/esql/_types/EsqlVersion.ts
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Licensed to Elasticsearch B.V. under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch B.V. licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-/**
- * The version of the ES|QL language in which the "query" field was written.
- */
-export enum EsqlVersion {
-  /**
-   * Run against the first version of ES|QL.
-   * @codegen_name V2024_04_01
-   */
-  '2024.04.01'
-}
-
-// Note: ideally this should be a constant of type EsqlVersion, but the schema.json model doesn't
-// has support for this. So define a new type that is just a literal value, to be used by code generators.
-
-/**
- * Version of the ES|QL language that should be used by default in stateful client libraries.
- *
- * This value is guaranteed to be stable within a major version of the Elastic Stack, even if newer versions
- * of the ES|QL language are added within that major version.
- */
-export type BaseStatefulEsqlVersion = '2024.04.01'
-
-/**
- * Version of the ES|QL language that should be used by default in serverless client libraries.
- *
- * This value is guaranteed to be stable for a given value of the Serverless API version, even if newer versions
- * of the ES|QL language are added within that API version.
- */
-export type BaseServerlessEsqlVersion = '2024.04.01'
diff --git a/specification/esql/query/QueryRequest.ts b/specification/esql/query/QueryRequest.ts
index 535f7b5d29..0dae2525cb 100644
--- a/specification/esql/query/QueryRequest.ts
+++ b/specification/esql/query/QueryRequest.ts
@@ -20,7 +20,6 @@
 import { RequestBase } from '@_types/Base'
 import { QueryContainer } from '@_types/query_dsl/abstractions'
 import { ScalarValue } from '@_types/common'
-import { EsqlVersion } from '@esql/_types/EsqlVersion'
 
 /**
  * Executes an ES|QL request
@@ -61,9 +60,5 @@ export interface Request extends RequestBase {
      * The ES|QL query API accepts an ES|QL query string in the query parameter, runs it, and returns the results.
      */
     query: string
-    /**
-     * The version of the ES|QL language in which the "query" field was written.
-     */
-    version: EsqlVersion
   }
 }