diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8515188e..3ca24f49 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased]
 ### Added
 ### Updated APIs
+- Updated opensearch-py APIs to reflect [opensearch-api-specification@8f4b485](https://github.com/opensearch-project/opensearch-api-specification/commit/8f4b485f22e80570fa2370b5a5c349897758ac12)
 - Updated opensearch-py APIs to reflect [opensearch-api-specification@3be80d7](https://github.com/opensearch-project/opensearch-api-specification/commit/3be80d700cccc60093ad6265a9582572c0b1e9f4)
 - Updated opensearch-py APIs to reflect [opensearch-api-specification@89c586c](https://github.com/opensearch-project/opensearch-api-specification/commit/89c586cfe65584f789e8fccc5f6c416cee1e8b3b)
 - Updated opensearch-py APIs to reflect [opensearch-api-specification@cac8c5d](https://github.com/opensearch-project/opensearch-api-specification/commit/cac8c5d8ab39c702c6c428cfdc3a3a710cf2c0b0)
diff --git a/opensearchpy/_async/client/plugins.py b/opensearchpy/_async/client/plugins.py
index 69dcb9da..01ed6240 100644
--- a/opensearchpy/_async/client/plugins.py
+++ b/opensearchpy/_async/client/plugins.py
@@ -30,11 +30,13 @@
 from ..plugins.sm import SmClient
 from ..plugins.sql import SqlClient
 from ..plugins.transforms import TransformsClient
+from ..plugins.ubi import UbiClient
 from .client import Client
 from .utils import NamespacedClient
 
 
 class PluginsClient(NamespacedClient):
+    ubi: Any
     security_analytics: Any
     search_relevance: Any
     sm: Any
@@ -57,6 +59,7 @@ class PluginsClient(NamespacedClient):
     def __init__(self, client: Client) -> None:
         super().__init__(client)
 
+        self.ubi = UbiClient(client)
         self.security_analytics = SecurityAnalyticsClient(client)
         self.search_relevance = SearchRelevanceClient(client)
         self.sm = SmClient(client)
@@ -84,6 +87,7 @@ def _dynamic_lookup(self, client: Any) -> None:
         # Issue : https://github.com/opensearch-project/opensearch-py/issues/90#issuecomment-1003396742
 
         plugins = [
+            "ubi",
             "security_analytics",
             "search_relevance",
             "sm",
diff --git a/opensearchpy/_async/plugins/ubi.py b/opensearchpy/_async/plugins/ubi.py
new file mode 100644
index 00000000..6b367c14
--- /dev/null
+++ b/opensearchpy/_async/plugins/ubi.py
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+#
+# Modifications Copyright OpenSearch Contributors. See
+# GitHub history for details.
+
+# ------------------------------------------------------------------------------------------
+# THIS CODE IS AUTOMATICALLY GENERATED AND MANUAL EDITS WILL BE LOST
+#
+# To contribute, kindly make modifications in the opensearch-py client generator
+# or in the OpenSearch API specification, and run `nox -rs generate`. See DEVELOPER_GUIDE.md
+# and https://github.com/opensearch-project/opensearch-api-specification for details.
+# -----------------------------------------------------------------------------------------+
+
+
+from typing import Any
+
+from ..client.utils import NamespacedClient, query_params
+
+
+class UbiClient(NamespacedClient):
+    @query_params("error_trace", "filter_path", "human", "pretty", "source")
+    async def initialize(
+        self,
+        *,
+        params: Any = None,
+        headers: Any = None,
+    ) -> Any:
+        """
+        Initializes the UBI indexes.
+
+
+        :arg error_trace: Whether to include the stack trace of returned
+            errors. Default is false.
+        :arg filter_path: A comma-separated list of filters used to
+            filter the response. Use wildcards to match any field or part of a
+            field's name. To exclude fields, use `-`.
+        :arg human: Whether to return human-readable values for
+            statistics. Default is false.
+        :arg pretty: Whether to pretty-format the returned JSON
+            response. Default is false.
+        :arg source: The URL-encoded request definition. Useful for
+            libraries that do not accept a request body for non-POST requests.
+        """
+        return await self.transport.perform_request(
+            "POST", "/_plugins/ubi/initialize", params=params, headers=headers
+        )
diff --git a/opensearchpy/client/plugins.py b/opensearchpy/client/plugins.py
index 69dcb9da..01ed6240 100644
--- a/opensearchpy/client/plugins.py
+++ b/opensearchpy/client/plugins.py
@@ -30,11 +30,13 @@
 from ..plugins.sm import SmClient
 from ..plugins.sql import SqlClient
 from ..plugins.transforms import TransformsClient
+from ..plugins.ubi import UbiClient
 from .client import Client
 from .utils import NamespacedClient
 
 
 class PluginsClient(NamespacedClient):
+    ubi: Any
     security_analytics: Any
     search_relevance: Any
     sm: Any
@@ -57,6 +59,7 @@ class PluginsClient(NamespacedClient):
     def __init__(self, client: Client) -> None:
         super().__init__(client)
 
+        self.ubi = UbiClient(client)
         self.security_analytics = SecurityAnalyticsClient(client)
         self.search_relevance = SearchRelevanceClient(client)
         self.sm = SmClient(client)
@@ -84,6 +87,7 @@ def _dynamic_lookup(self, client: Any) -> None:
         # Issue : https://github.com/opensearch-project/opensearch-py/issues/90#issuecomment-1003396742
 
         plugins = [
+            "ubi",
             "security_analytics",
             "search_relevance",
             "sm",
diff --git a/opensearchpy/plugins/ubi.py b/opensearchpy/plugins/ubi.py
new file mode 100644
index 00000000..d8de573e
--- /dev/null
+++ b/opensearchpy/plugins/ubi.py
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+#
+# Modifications Copyright OpenSearch Contributors. See
+# GitHub history for details.
+
+# ------------------------------------------------------------------------------------------
+# THIS CODE IS AUTOMATICALLY GENERATED AND MANUAL EDITS WILL BE LOST
+#
+# To contribute, kindly make modifications in the opensearch-py client generator
+# or in the OpenSearch API specification, and run `nox -rs generate`. See DEVELOPER_GUIDE.md
+# and https://github.com/opensearch-project/opensearch-api-specification for details.
+# -----------------------------------------------------------------------------------------+
+
+
+from typing import Any
+
+from ..client.utils import NamespacedClient, query_params
+
+
+class UbiClient(NamespacedClient):
+    @query_params("error_trace", "filter_path", "human", "pretty", "source")
+    def initialize(
+        self,
+        *,
+        params: Any = None,
+        headers: Any = None,
+    ) -> Any:
+        """
+        Initializes the UBI indexes.
+
+
+        :arg error_trace: Whether to include the stack trace of returned
+            errors. Default is false.
+        :arg filter_path: A comma-separated list of filters used to
+            filter the response. Use wildcards to match any field or part of a
+            field's name. To exclude fields, use `-`.
+        :arg human: Whether to return human-readable values for
+            statistics. Default is false.
+        :arg pretty: Whether to pretty-format the returned JSON
+            response. Default is false.
+        :arg source: The URL-encoded request definition. Useful for
+            libraries that do not accept a request body for non-POST requests.
+        """
+        return self.transport.perform_request(
+            "POST", "/_plugins/ubi/initialize", params=params, headers=headers
+        )