chore(opensearch): Add changelogs

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

Author: Fyusel

CHANGELOG.md

@@ -348,6 +348,13 @@
     - **Improvement:** Use new WaiterHelper for opensearch waiters
   - [v0.29.0](services/opensearch/CHANGELOG.md#v0290)
     - **Feature:** Introduce enums for various attributes
+  - [v1.0.0](services/opensearch/CHANGELOG.md#v100)
+    - `v2api`:
+      - **Breaking Change:** The region is no longer specified within the client configuration. Instead, the region must be passed as a parameter to any region-specific request.
+      - **Deprecation:** `TlsCiphers`, `TlsProtocols` from `InstanceParameters` model are deprecated and will be removed 2026-12-12.
+    - `v1api`:
+      - **Feature:** Added optional `CreateCredentialsPayload` to `ApiCreateCredentialsRequest`.
+      - **Deprecation:** `TlsCiphers`, `TlsProtocols` from `InstanceParameters` model are deprecated and will be removed 2026-12-12.
 - `postgresflex`:
   - [v1.6.3](services/postgresflex/CHANGELOG.md#v163) 
     - **Dependencies:** Bump STACKIT SDK core module from `v0.24.0` to `v0.24.1`

services/opensearch/CHANGELOG.md

@@ -1,3 +1,11 @@
+## v1.0.0
+- `v2api`:
+  - **Breaking Change:** The region is no longer specified within the client configuration. Instead, the region must be passed as a parameter to any region-specific request.
+  - **Deprecation:** `TlsCiphers`, `TlsProtocols` from `InstanceParameters` model are deprecated and will be removed 2026-12-12.
+- `v1api`:
+  - **Feature:** Added optional `CreateCredentialsPayload` to `ApiCreateCredentialsRequest`.
+  - **Deprecation:** `TlsCiphers`, `TlsProtocols` from `InstanceParameters` model are deprecated and will be removed 2026-12-12.
+
 ## v0.29.0
 - **Feature:** Introduce enums for various attributes
 

services/opensearch/VERSION

@@ -1 +1 @@
-v0.29.0
+v1.0.0