Fixes issue-14295: Correctly pass along the kwargs (#14296)

- **Description:** Update code to correctly pass the kwargs 
  - **Issue:** #14295 
  - **Dependencies:**  - 
  - **Tag maintainer:** 

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#issue-14295

libs/langchain/langchain/vectorstores/opensearch_vector_search.py

@@ -414,7 +414,7 @@ class OpenSearchVectorSearch(VectorStore):
             metadatas=metadatas,
             ids=ids,
             bulk_size=bulk_size,
-            kwargs=kwargs,
+            **kwargs,
         )
 
     def add_embeddings(
@@ -451,7 +451,7 @@ class OpenSearchVectorSearch(VectorStore):
             metadatas=metadatas,
             ids=ids,
             bulk_size=bulk_size,
-            kwargs=kwargs,
+            **kwargs,
         )
 
     def similarity_search(