diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 7e750bfb32..30bda52f0e 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -61912,9 +61912,9 @@
       "indices._types:SourceMode": {
         "type": "string",
         "enum": [
-          "disabled",
-          "stored",
-          "synthetic"
+          "DISABLED",
+          "STORED",
+          "SYNTHETIC"
         ]
       },
       "indices._types:IndexingSlowlogSettings": {
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index fe7ff73c20..bc395e1668 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -40677,9 +40677,9 @@
       "indices._types:SourceMode": {
         "type": "string",
         "enum": [
-          "disabled",
-          "stored",
-          "synthetic"
+          "DISABLED",
+          "STORED",
+          "SYNTHETIC"
         ]
       },
       "indices._types:IndexingSlowlogSettings": {
diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index 36b2972585..63f1af33ce 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -95974,13 +95974,13 @@
       "kind": "enum",
       "members": [
         {
-          "name": "disabled"
+          "name": "DISABLED"
         },
         {
-          "name": "stored"
+          "name": "STORED"
         },
         {
-          "name": "synthetic"
+          "name": "SYNTHETIC"
         }
       ],
       "name": {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 2b8758de8d..d4f3a046e2 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -131399,13 +131399,13 @@
       "kind": "enum",
       "members": [
         {
-          "name": "disabled"
+          "name": "DISABLED"
         },
         {
-          "name": "stored"
+          "name": "STORED"
         },
         {
-          "name": "synthetic"
+          "name": "SYNTHETIC"
         }
       ],
       "name": {
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 1082366287..6fc5af5390 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -11516,7 +11516,7 @@ export interface IndicesSoftDeletes {
   retention_lease?: IndicesRetentionLease
 }
 
-export type IndicesSourceMode = 'disabled' | 'stored' | 'synthetic'
+export type IndicesSourceMode = 'DISABLED' | 'STORED' | 'SYNTHETIC'
 
 export interface IndicesStorage {
   type: IndicesStorageType
diff --git a/specification/indices/_types/IndexSettings.ts b/specification/indices/_types/IndexSettings.ts
index 038ea7617b..b2d19a6ec2 100644
--- a/specification/indices/_types/IndexSettings.ts
+++ b/specification/indices/_types/IndexSettings.ts
@@ -499,9 +499,9 @@ export class MappingLimitSettingsSourceFields {
 }
 
 export enum SourceMode {
-  disabled,
-  stored,
-  synthetic
+  DISABLED,
+  STORED,
+  SYNTHETIC
 }
 
 export class SlowlogSettings {