Update changelog

Signed-off-by: Andy Qin <[email protected]>

Author: q-andy

CHANGELOG-3.0.md

@@ -51,6 +51,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Use Lucene `BM25Similarity` as default since the `LegacyBM25Similarity` is marked as deprecated ([#17306](https://github.com/opensearch-project/OpenSearch/pull/17306))
 - Wildcard field index only 3gram of the input data [#17349](https://github.com/opensearch-project/OpenSearch/pull/17349)
 - Use BC libraries to parse PEM files, increase key length, allow general use of known cryptographic binary extensions, remove unused BC dependencies ([#3420](https://github.com/opensearch-project/OpenSearch/pull/14912))
+- Add optional enum set read / write functionality to stream input / output ([#17556](https://github.com/opensearch-project/OpenSearch/pull/17556))
 
 ### Deprecated