Resync CHANGELOG (#1175)

* changelog: regroup changes actually released with v11.5.0

* changelog: forward-port entry from backport 11.4 release

CHANGELOG.md

@@ -139,9 +139,11 @@
 
 ## 11.5.0
  - Feat: add ssl_supported_protocols option [#1055](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1055)
+ - [DOC] Add `v8` to supported values for ecs_compatiblity defaults [#1059](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1059)
 
 ## 11.4.2
- - [DOC] Add `v8` to supported values for ecs_compatiblity defaults [#1059](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1059)
+- Fixes an issue where events containing non-unicode strings could fail to serialize correctly when compression is enabled [#1169](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1169)
+  - NOTE: This is a backport of the relevant fix from v11.22.3 to the 11.4 series for inclusion with Logstash 7.17 maintenance releases
 
 ## 11.4.1
  - Feat: upgrade manticore (http-client) library [#1063](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1063)