Revert "integrations[patch]: remove non-required chat param defaults" (#29048)

Reverts langchain-ai/langchain#26730

discuss best way to release default changes (esp openai temperature)

libs/partners/mistralai/langchain_mistralai/chat_models.py

@@ -95,11 +95,8 @@ def _create_retry_decorator(
     """Returns a tenacity retry decorator, preconfigured to handle exceptions"""
 
     errors = [httpx.RequestError, httpx.StreamError]
-    kwargs: dict = dict(
-        error_types=errors, max_retries=llm.max_retries, run_manager=run_manager
-    )
     return create_base_retry_decorator(
-        **{k: v for k, v in kwargs.items() if v is not None}
+        error_types=errors, max_retries=llm.max_retries, run_manager=run_manager
     )
 
 
@@ -383,13 +380,13 @@ class ChatMistralAI(BaseChatModel):
         default_factory=secret_from_env("MISTRAL_API_KEY", default=None),
     )
     endpoint: Optional[str] = Field(default=None, alias="base_url")
-    max_retries: Optional[int] = None
-    timeout: Optional[int] = None
-    max_concurrent_requests: Optional[int] = None
+    max_retries: int = 5
+    timeout: int = 120
+    max_concurrent_requests: int = 64
     model: str = Field(default="mistral-small", alias="model_name")
-    temperature: Optional[float] = None
+    temperature: float = 0.7
     max_tokens: Optional[int] = None
-    top_p: Optional[float] = None
+    top_p: float = 1
     """Decode using nucleus sampling: consider the smallest set of tokens whose
        probability sum is at least top_p. Must be in the closed interval [0.0, 1.0]."""
     random_seed: Optional[int] = None