fix(specs): body is not required in multiple batch request (generated)

algolia/api-clients-automation#3454

Co-authored-by: algolia-bot <accounts+algolia-api-client-bot@algolia.com>
Co-authored-by: Kai Welke <kai.welke@algolia.com>

algoliasearch/search/models/multiple_batch_request.py

@@ -7,7 +7,7 @@
 from __future__ import annotations
 
 from json import loads
-from typing import Any, Dict, Self
+from typing import Any, Dict, Optional, Self
 
 from pydantic import BaseModel, ConfigDict, Field, StrictStr
 
@@ -20,8 +20,9 @@ class MultipleBatchRequest(BaseModel):
     """
 
     action: Action
-    body: Dict[str, Any] = Field(
-        description="Operation arguments (varies with specified `action`)."
+    body: Optional[Dict[str, Any]] = Field(
+        default=None,
+        description="Operation arguments (varies with specified `action`).",
     )
     index_name: StrictStr = Field(
         description="Index name (case-sensitive).", alias="indexName"