## 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 `ContentLanguage
`.`
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.