Release notes for Elasticsearch 8 support (#10686)

CHANGELOG.txt

@@ -6,6 +6,7 @@ Changelog
 
  * Add support for read-only FieldPanels (Andy Babic)
  * Add support for query-time boosting to Elasticsearch 6 and above (Shohan Dutta Roy)
+ * Add support for Elasticsearch 8 (Matt Westcott, Wesley van Lee)
  * Mark calls to `md5` as not being used for secure purposes, to avoid flagging on FIPS-mode systems (Sean Kelly)
  * Return filters from `parse_query_string` as a `QueryDict` to support multiple values (Aman Pandey)
  * Explicitly specify `MenuItem.name` for all admin menu and submenu items (Justin Koestinger)

docs/releases/5.1.md

@@ -34,6 +34,10 @@ The `wagtail start` command now supports an optional `--template` argument that
 
 The `boost` option on `SearchField`, to increase the ranking of search results that match on the specified field, is now respected by Elasticsearch 6 and above. This was previously only supported up to Elasticsearch 5, due to a change in Elasticsearch's API. This feature was developed by Shohan Dutta Roy.
 
+### Elasticsearch 8 support
+
+This release adds support for Elasticsearch 8. This can be set up by installing a version 8.x release of the `elasticsearch` Python package, and setting `wagtail.search.backends.elasticsearch8` as the search backend. Compatibility updates were contributed by Matt Westcott and Wesley van Lee.
+
 ### Extend Stimulus adoption
 
 As part of tackling Wagtail’s technical debt and improving [CSP compatibility](https://github.com/wagtail/wagtail/issues/1288), we have continued extending our usage of Stimulus, based on the plans laid out in [RFC 78: Adopt Stimulus](https://github.com/wagtail/rfcs/pull/78).