Add rerank task type specification (#4488) (#4743)

(cherry picked from commit 7c4997b)

Co-authored-by: Tim Grein <[email protected]>
Co-authored-by: Quentin Pradet <[email protected]>

Author: 3 people

output/schema/schema.json

@@ -771,13 +771,26 @@ export class EisServiceSettings {
 }
 
 export enum EisTaskType {
-  chat_completion
+  chat_completion,
+  rerank
 }
 
 export enum EisServiceType {
   elastic
 }
 
+export class EisTaskSettings {
+  /**
+   * For a `rerank` task, return doc text within the results.
+   */
+  return_documents?: boolean
+
+  /**
+   * For a `rerank` task, the number of the top N documents that should be returned.
+   */
+  top_n?: integer
+}
+
 export class ElasticsearchServiceSettings {
   /**
    * Adaptive allocations configuration details.