multiple: pydantic 2 compatibility, v0.3 (#26443)

Signed-off-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Dan O'Donovan <dan.odonovan@gmail.com>
Co-authored-by: Tom Daniel Grande <tomdgrande@gmail.com>
Co-authored-by: Grande <Tom.Daniel.Grande@statsbygg.no>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Tomaz Bratanic <bratanic.tomaz@gmail.com>
Co-authored-by: ZhangShenao <15201440436@163.com>
Co-authored-by: Friso H. Kingma <fhkingma@gmail.com>
Co-authored-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Morgante Pell <morgantep@google.com>

libs/community/langchain_community/retrievers/bedrock.py

@@ -2,8 +2,8 @@ from typing import Any, Dict, List, Optional
 
 from langchain_core.callbacks import CallbackManagerForRetrieverRun
 from langchain_core.documents import Document
-from langchain_core.pydantic_v1 import BaseModel, root_validator
 from langchain_core.retrievers import BaseRetriever
+from pydantic import BaseModel, model_validator
 
 
 class VectorSearchConfig(BaseModel, extra="allow"):  # type: ignore[call-arg]
@@ -105,8 +105,9 @@ class AmazonKnowledgeBasesRetriever(BaseRetriever):
     client: Any
     retrieval_config: RetrievalConfig
 
-    @root_validator(pre=True)
-    def create_client(cls, values: Dict[str, Any]) -> Dict[str, Any]:
+    @model_validator(mode="before")
+    @classmethod
+    def create_client(cls, values: Dict[str, Any]) -> Any:
         if values.get("client") is not None:
             return values