enum to string in response (#3705) (#3710)

(cherry picked from commit 8e8c3ac)

Co-authored-by: Laura Trotta <[email protected]>

Author: github-actions[bot]

output/schema/schema-serverless.json

@@ -68,18 +68,11 @@ 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
    * doc.
    */
   error?: ErrorCause
 }
-
-/**
- * These are the names of the keys in a Dictionary in the ignored_fields Array.
- */
-enum IgnoredFieldKey {
-  field
-}