Pass through index aliases when checking if index closed

CHANGELOG.md

@@ -13,6 +13,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Removed
 ### Fixed
 - Moved client tests to dedicated files to ensure they are run ([944](https://github.com/opensearch-project/opensearch-py/pull/944))
+- Fix `Index.is_closed` not passing through aliases to the underlying index, preventing saving ([941](https://github.com/opensearch-project/opensearch-py/pull/941))
+
 ### Security
 ### Dependencies
 - Bumps `aiohttp` from >=3.9.4,<4 to >=3.10.11,<4 ([#920](https://github.com/opensearch-project/opensearch-py/pull/920))

opensearchpy/_async/helpers/index.py

@@ -288,7 +288,12 @@ async def is_closed(self, using: Any = None) -> Any:
         state = await (await self._get_connection(using)).cluster.state(
             index=self._name, metric="metadata"
         )
-        return state["metadata"]["indices"][self._name]["state"] == "close"
+        index_name = (
+            next(iter(state["metadata"]["indices"].keys()))
+            if len(state["metadata"]["indices"].keys()) == 1
+            else self._name
+        )
+        return state["metadata"]["indices"][index_name]["state"] == "close"
 
     async def save(self, using: Any = None) -> Any:
         """

opensearchpy/helpers/index.py

@@ -309,7 +309,12 @@ def is_closed(self, using: Optional[OpenSearch] = None) -> Any:
         state = self._get_connection(using).cluster.state(
             index=self._name, metric="metadata"
         )
-        return state["metadata"]["indices"][self._name]["state"] == "close"
+        index_name = (
+            next(iter(state["metadata"]["indices"].keys()))
+            if len(state["metadata"]["indices"].keys()) == 1
+            else self._name
+        )
+        return state["metadata"]["indices"][index_name]["state"] == "close"
 
     def save(self, using: Optional[OpenSearch] = None) -> Any:
         """