feat: update indexing endpoint for new name (#5725)

This endpoint is changing to allow for multiple settings resources to be grouped under `/setttings/...`.

packages/sanity/src/core/studio/components/navbar/search/hooks/useSearchMaxFieldDepth.ts

@@ -39,7 +39,7 @@ const INITIAL_LOADING_STATE: Settings = {
 function fetchMaxDepth({client}: {client: SanityClient}): Observable<PartialIndexSettings> {
   const {projectId, dataset} = client.config()
   return client.observable.request<PartialIndexSettings>({
-    uri: `/projects/${projectId}/datasets/${dataset}/index-settings`,
+    uri: `/projects/${projectId}/datasets/${dataset}/settings/indexing`,
     tag: 'search.getPartialIndexSettings',
   })
 }