fix flaky id in polling (Azure#19921)

Author: kristapratico

sdk/translation/azure-ai-translation-document/azure/ai/translation/document/_polling.py

@@ -94,7 +94,7 @@ def _current_body(self):
 
     def _get_id_from_headers(self):
         # type: () -> str
-        return self._pipeline_response.http_response.headers[
+        return self._initial_response.http_response.headers[
             "Operation-Location"
         ].split("/batches/")[1]
 

sdk/translation/azure-ai-translation-document/azure/ai/translation/document/aio/_async_polling.py

@@ -76,7 +76,7 @@ def _current_body(self) -> _TranslationStatus:
         return _TranslationStatus.deserialize(self._pipeline_response)
 
     def _get_id_from_headers(self) -> str:
-        return self._pipeline_response.http_response.headers[
+        return self._initial_response.http_response.headers[
             "Operation-Location"
         ].split("/batches/")[1]