---
title: Breaking changes for Optimizely Search & Navigation 13
slug: cms-12/docs/breaking-changes-for-find-13
docTags: 
createdAt: 2026-08-10T15:56:03.000Z
---

## List of changes

- `EPiServer.Find.Api.Facets.NestedFacetExtensions` was removed. Use `EPiServer.Find.NestedFacetExtensions` (available since Optimizely Search & Navigation 13).
- `EPiServer.Find.Api.Querying.Filters.NestedFilterExtensions` was removed. Use `EPiServer.Find.NestedFilterExtensions` (available since Optimizely Search & Navigation 13).
- Removed index operations from the `EPiServer.Find.Api`-namespace (`CreateIndex`, `DeleteIndex`, `IndicesExists`). The Find backend blocks the use of index operations (and always has).
- `ISearchContext.Language` was renamed `ContentLanguage`.
- `ISearchContext.Analyzer` was added.

## Reindex the site

The language routing changes make it necessary to reindex the site after upgrading to Optimizely Search & Navigation 13.