Update README.md

x-pack/plugins/index_management/README.md

@@ -7,14 +7,15 @@ This service is exposed from the Index Management setup contract and can be used
 - `addToggle(toggle: any)`: adds a toggle to the indices list, for example to display hidden indices
 - `addColumn(column: IndicesListColumn)`: adds a column to the indices list, for example to display an ILM phase
 - `setEmptyListContent(content: EmptyListContent)`: replaces the default empty prompt displayed when there are no indices in the indices list. The empty list content has the following interface:
-
 ```ts
 export interface EmptyListContent {
   renderContent: (args: {
     createIndexButton: ReturnType<FunctionComponent>;
   }) => ReturnType<FunctionComponent>;
 }
 ```
+- `setIndexDetailsPageRoute`: registers a new route for index details page in indices list table. for example for serverless search users, the indices list page index is navigated to search_indices index detail page 
+
 
 #### Extensions to the indices list and the index details page
 - `addAction(action: any)`: adds an option to the "manage index" menu, for example to add an ILM policy to the index