Correcting the response format for ingest simulate

Author: masseyke

output/openapi/elasticsearch-openapi.json

@@ -17,8 +17,56 @@
  * under the License.
  */
 
-import { SimulateDocumentResult } from '@ingest/_types/Simulation'
+import { AdditionalProperties } from '@spec_utils/behaviors'
+import { Dictionary } from '@spec_utils/Dictionary'
+import { Stringified } from '@spec_utils/Stringified'
+import { UserDefinedValue } from '@spec_utils/UserDefinedValue'
+import { Id, IndexName, VersionNumber } from '@_types/common'
+import { ErrorCause } from '@_types/Errors'
 
 export class Response {
   body: { docs: SimulateDocumentResult[] }
 }
+
+export class SimulateDocumentResult {
+  doc?: DocumentSimulation
+  /**
+   * 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
+}
+
+/**
+ * The results of ingest simulation on a single document. The _source of the document contains
+ * the results after running all pipelines listed in executed_pipelines on the document. The
+ * list of executed pipelines is derived from the pipelines that would be executed if this
+ * document had been ingested into _index.
+ *
+ * @behavior_meta AdditionalProperties fieldname=metadata description="Additional metadata"
+ */
+export class DocumentSimulation
+  implements AdditionalProperties<string, string>
+{
+  /**
+   * Identifier for the document.
+   */
+  _id: Id
+  /**
+   * Name of the index that the document would be indexed into if this were not a simulation.
+   */
+  _index: IndexName
+  /**
+   * JSON body for the document.
+   */
+  _source: Dictionary<string, UserDefinedValue>
+  /**
+   *
+   */
+  _version?: Stringified<VersionNumber>
+  /**
+   * A list of the names of the pipelines executed on this document.
+   */
+  executed_pipelines: Array<string>
+}