Doc: Move 9.0 pre-release notes to release notes (#17439)

Author: karenzone

docs/release-notes/index.md

@@ -25,6 +25,72 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
 ### Features and enhancements [logstash-900-features-enhancements]
 
+* Use UBI9 as base image [#17174](https://github.com/elastic/logstash/pull/17174)
+* Improve plugins remove command to support multiple plugins [#17030](https://github.com/elastic/logstash/pull/17030)
+* Allow concurrent Batch deserialization [#17050](https://github.com/elastic/logstash/pull/17050)
+
 ### Fixes [logstash-900-fixes]
 
-### Plugins [logstash-plugin-900-changes]
+* Fix pqcheck and pqrepair on Windows [#17210](https://github.com/elastic/logstash/pull/17210)
+* Fix empty node stats pipelines [#17185](https://github.com/elastic/logstash/pull/17185)
+
+### Plugins [logstash-plugin-900-changes]
+
+**elastic_integration Filter - 9.0.0**
+
+* 9.0 prerelease compatible plugin version [#265](https://github.com/elastic/logstash-filter-elastic_integration/pull/265)
+
+**Elasticsearch Filter - 4.1.0**
+
+* Remove deprecated SSL settings [#183](https://github.com/logstash-plugins/logstash-filter-elasticsearch/pull/183)
+
+**Http Filter - 2.0.0**
+
+* Remove deprecated SSL settings [#54](https://github.com/logstash-plugins/logstash-filter-http/pull/54)
+
+**Beats Input - 7.0.1**
+
+* Remove deprecated SSL settings [#508](https://github.com/logstash-plugins/logstash-input-beats/pull/508)
+
+**Elastic_serverless_forwarder Input - 2.0.0**
+
+* Remove deprecated SSL settings [#11](https://github.com/logstash-plugins/logstash-input-elastic_serverless_forwarder/pull/11)
+
+* Promote from technical preview to GA [#10](https://github.com/logstash-plugins/logstash-input-elastic_serverless_forwarder/pull/10)
+
+**Elasticsearch Input - 5.0.0**
+
+* Remove deprecated SSL settings [#213](https://github.com/logstash-plugins/logstash-input-elasticsearch/pull/213)
+
+**Http Input - 4.1.0**
+
+* Remove deprecated SSL settings [#182](https://github.com/logstash-plugins/logstash-input-http/pull/182)
+
+**Http_poller Input - 6.0.0**
+
+* Remove deprecated SSL settings [#149](https://github.com/logstash-plugins/logstash-input-http_poller/pull/149)
+
+**Tcp Input - 7.0.0**
+
+* Remove deprecated SSL settings [#228](https://github.com/logstash-plugins/logstash-input-tcp/pull/228)
+
+**Kafka Integration - 11.6.0**
+
+* Support additional `oauth` and `sasl` configuration options for configuring kafka client [#189](https://github.com/logstash-plugins/logstash-integration-kafka/pull/189)
+
+**Snmp Integration - 4.0.6**
+
+* [DOC] Fix typo in snmptrap migration section [#74](https://github.com/logstash-plugins/logstash-integration-snmp/pull/74)
+
+**Elasticsearch Output - 12.0.2**
+
+* Remove deprecated SSL settings [#1197](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1197)
+
+**Http Output - 6.0.0**
+
+* Remove deprecated SSL settings [#147](https://github.com/logstash-plugins/logstash-output-http/pull/147)
+
+**Tcp Output - 7.0.0**
+
+* Remove deprecated SSL settings [#58](https://github.com/logstash-plugins/logstash-output-tcp/pull/58)
+