fix SavedObjectMigrationMap type

Author: pgayvallet

docs/development/plugins/data/server/kibana-plugin-plugins-data-server.iindexpattern.md

@@ -21,3 +21,9 @@ export interface IIndexPattern
 |  [title](./kibana-plugin-plugins-data-server.iindexpattern.title.md) | <code>string</code> |  |
 |  [type](./kibana-plugin-plugins-data-server.iindexpattern.type.md) | <code>string</code> |  |
 
+## Methods
+
+|  Method | Description |
+|  --- | --- |
+|  [getTimeField()](./kibana-plugin-plugins-data-server.iindexpattern.gettimefield.md) |  |
+

src/core/server/saved_objects/migrations/types.ts

@@ -88,5 +88,5 @@ export interface SavedObjectMigrationContext {
  * @public
  */
 export interface SavedObjectMigrationMap {
-  [version: string]: SavedObjectMigrationFn;
+  [version: string]: SavedObjectMigrationFn<any, any>;
 }

src/core/server/server.api.md

@@ -1735,7 +1735,7 @@ export type SavedObjectMigrationFn<InputAttributes = unknown, MigratedAttributes
 // @public
 export interface SavedObjectMigrationMap {
     // (undocumented)
-    [version: string]: SavedObjectMigrationFn;
+    [version: string]: SavedObjectMigrationFn<any, any>;
 }
 
 // @public