Add changelog entry

Signed-off-by: Thomas Farr <tsfarr@amazon.com>

CHANGELOG.md

@@ -20,6 +20,7 @@ This section is for maintaining a changelog for all breaking changes for the cli
 - Migrate client transports to Apache HttpClient / Core 5.x ([#246](https://github.com/opensearch-project/opensearch-java/pull/246))
 - Changed SearchAfter of SearchRequest type to FieldValue instead of String ([#769](https://github.com/opensearch-project/opensearch-java/pull/769))
 - Changed type of `DanglingIndex`'s `creationDateMillis` field from `String` to `long` ([#1124](https://github.com/opensearch-project/opensearch-java/pull/1124))
+- Changed type of `ShardStatistics`'s `total`, `successful`, `failed` & `skipped` fields from `Number` to `int/Integer` ([#1158](https://github.com/opensearch-project/opensearch-java/pull/1158))
 
 ### Deprecated
 - Deprecate RestClientTransport ([#536](https://github.com/opensearch-project/opensearch-java/pull/536))
@@ -34,8 +35,9 @@ This section is for maintaining a changelog for all breaking changes for the cli
 ## [Unreleased 2.x]
 
 ### Added
-- Adds `queryImage` (query_image) field to `NeuralQuery`, following definition in ([Neural Query](https://opensearch.org/docs/latest/query-dsl/specialized/neural/)) ([#1137](https://github.com/opensearch-project/opensearch-java/pull/1138))
-- Adds `cancelAfterTimeInterval` to `SearchRequest` and `MsearchRequest` ([#1147](https://github.com/opensearch-project/opensearch-java/pull/1147))
+- Added `queryImage` (query_image) field to `NeuralQuery`, following definition in ([Neural Query](https://opensearch.org/docs/latest/query-dsl/specialized/neural/)) ([#1137](https://github.com/opensearch-project/opensearch-java/pull/1138))
+- Added `cancelAfterTimeInterval` to `SearchRequest` and `MsearchRequest` ([#1147](https://github.com/opensearch-project/opensearch-java/pull/1147))
+- Added the `ml` namespace operations ([#1158](https://github.com/opensearch-project/opensearch-java/pull/1158))
 
 ### Dependencies