Version 2.12 Release Notes (#110)

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

release-notes/opensearch-custom-codecs.release-notes-2.12.0.0.md

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+## 2024-02-08 Version 2.12.0.0
+
+Compatible with OpenSearch 2.12.0
+
+### Features
+
+* Accessors for custom compression modes ([#90](https://github.com/opensearch-project/custom-codecs/pull/90))
+* Lucene 9.9.1 Upgrade ([#99](https://github.com/opensearch-project/custom-codecs/pull/99))
+
+
+### Bug fixes
+
+* GA updates and minor BWC test cleanups ([#105](https://github.com/opensearch-project/custom-codecs/pull/105))
+
+### Infrastructure
+
+* Onboard jenkins prod docker images to github actions ([#77](https://github.com/opensearch-project/custom-codecs/pull/77))
+* Switch to ci-runner user for the checks ([#82](https://github.com/opensearch-project/custom-codecs/pull/82))
+* Add updateVersion gradle task from plugin template ([#87](https://github.com/opensearch-project/custom-codecs/pull/87))
+
+### Documentation
+
+* Version 2.12 Release Notes ([#110](https://github.com/opensearch-project/custom-codecs/pull/110))