weaviate: Add-deprecation-warning (#29757)

- **Description:** add deprecation warning when using weaviate from
langchain_community
  - **Issue:** NA
  - **Dependencies:** NA
  - **Twitter handle:** NA

---------

Signed-off-by: hsm207 <hsm207@users.noreply.github.com>
Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/community/langchain_community/retrievers/weaviate_hybrid_search.py

@@ -3,12 +3,18 @@ from __future__ import annotations
 from typing import Any, Dict, List, Optional, cast
 from uuid import uuid4
 
+from langchain_core._api import deprecated
 from langchain_core.callbacks import CallbackManagerForRetrieverRun
 from langchain_core.documents import Document
 from langchain_core.retrievers import BaseRetriever
 from pydantic import ConfigDict, model_validator
 
 
+@deprecated(
+    since="0.3.18",
+    removal="1.0",
+    alternative_import="langchain_weaviate.WeaviateVectorStore",
+)
 class WeaviateHybridSearchRetriever(BaseRetriever):
     """`Weaviate hybrid search` retriever.
 

libs/community/langchain_community/vectorstores/weaviate.py

@@ -15,6 +15,7 @@ from typing import (
 from uuid import uuid4
 
 import numpy as np
+from langchain_core._api import deprecated
 from langchain_core.documents import Document
 from langchain_core.embeddings import Embeddings
 from langchain_core.vectorstores import VectorStore
@@ -65,6 +66,11 @@ def _json_serializable(value: Any) -> Any:
     return value
 
 
+@deprecated(
+    since="0.3.18",
+    removal="1.0",
+    alternative_import="langchain_weaviate.WeaviateVectorStore",
+)
 class Weaviate(VectorStore):
     """`Weaviate` vector store.