diff --git a/output/schema/schema-serverless.json b/output/schema/schema-serverless.json
index 03f0bcf643..6321ce2cd6 100644
--- a/output/schema/schema-serverless.json
+++ b/output/schema/schema-serverless.json
@@ -105791,19 +105791,6 @@
       },
       "specLocation": "shutdown/get_node/ShutdownGetNodeResponse.ts#L40-L43"
     },
-    {
-      "kind": "enum",
-      "members": [
-        {
-          "name": "field"
-        }
-      ],
-      "name": {
-        "name": "IgnoredFieldKey",
-        "namespace": "simulate.ingest"
-      },
-      "specLocation": "simulate/ingest/SimulateIngestResponse.ts#L80-L85"
-    },
     {
       "kind": "type_alias",
       "name": {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index badb1e63ea..2f96cbd5f8 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -207769,19 +207769,6 @@
       },
       "specLocation": "shutdown/put_node/ShutdownPutNodeResponse.ts#L22-L24"
     },
-    {
-      "kind": "enum",
-      "members": [
-        {
-          "name": "field"
-        }
-      ],
-      "name": {
-        "name": "IgnoredFieldKey",
-        "namespace": "simulate.ingest"
-      },
-      "specLocation": "simulate/ingest/SimulateIngestResponse.ts#L80-L85"
-    },
     {
       "kind": "interface",
       "attachedBehaviors": [
@@ -207911,8 +207898,8 @@
               "key": {
                 "kind": "instance_of",
                 "type": {
-                  "name": "IgnoredFieldKey",
-                  "namespace": "simulate.ingest"
+                  "name": "string",
+                  "namespace": "_builtins"
                 }
               },
               "singleKey": false,
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 8e4925c627..d297312f02 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -19459,19 +19459,17 @@ export interface ShutdownPutNodeRequest extends RequestBase {
 
 export type ShutdownPutNodeResponse = AcknowledgedResponseBase
 
-export type SimulateIngestIgnoredFieldKey = 'field'
-
 export interface SimulateIngestIngestDocumentSimulationKeys {
   _id: Id
   _index: IndexName
   _source: Record<string, any>
   _version: SpecUtilsStringified<VersionNumber>
   executed_pipelines: string[]
-  ignored_fields?: Record<SimulateIngestIgnoredFieldKey, string>[]
+  ignored_fields?: Record<string, string>[]
   error?: ErrorCause
 }
 export type SimulateIngestIngestDocumentSimulation = SimulateIngestIngestDocumentSimulationKeys
-  & { [property: string]: string | Id | IndexName | Record<string, any> | SpecUtilsStringified<VersionNumber> | string[] | Record<SimulateIngestIgnoredFieldKey, string>[] | ErrorCause }
+  & { [property: string]: string | Id | IndexName | Record<string, any> | SpecUtilsStringified<VersionNumber> | string[] | Record<string, string>[] | ErrorCause }
 
 export interface SimulateIngestRequest extends RequestBase {
   index?: IndexName
diff --git a/specification/simulate/ingest/SimulateIngestResponse.ts b/specification/simulate/ingest/SimulateIngestResponse.ts
index f7250689dd..25af7df7e6 100644
--- a/specification/simulate/ingest/SimulateIngestResponse.ts
+++ b/specification/simulate/ingest/SimulateIngestResponse.ts
@@ -68,7 +68,7 @@ export class IngestDocumentSimulation
    * value is larger than the allowed limit would make it through all of the pipelines, but
    * would not be indexed into Elasticsearch.
    */
-  ignored_fields?: Array<Dictionary<IgnoredFieldKey, string>>
+  ignored_fields?: Array<Dictionary<string, string>>
   /**
    * Any error resulting from simulatng ingest on this doc. This can be an error generated by
    * executing a processor, or a mapping validation error when simulating indexing the resulting
@@ -76,10 +76,3 @@ export class IngestDocumentSimulation
    */
   error?: ErrorCause
 }
-
-/**
- * These are the names of the keys in a Dictionary in the ignored_fields Array.
- */
-enum IgnoredFieldKey {
-  field
-}