## List of changes
EPiServer.Find.Api.Facets.NestedFacetExtensions` was removed. Use `
EPiServer.Find.NestedFacetExtensions` (available since Optimizely Search & Navigation 12).
EPiServer.Find.Api.Querying.Filters.NestedFilterExtensions` was removed. Use `
EPiServer.Find.NestedFilterExtensions` (available since Optimizely Search & Navigation 12).
All index operations have been removed from the `
EPiServer.Find.Api`-namespace (CreateIndex_/DeleteIndex_/IndicesExists\*). Any use of index operations is blocked by the Find backend (and always has been).
ISearchContext.Language` was renamed `
ISearchContext.Analyzer` was added.
## Reindex the site
The language routing changes make it necessary to re-index the site after upgrading to Optimizely Search & Navigation 13.