fix old "Document" import

src/pipeline.py

@@ -4,7 +4,11 @@ from pathlib import Path
 from dataclasses import dataclass
 from typing import Dict, Any, List, Optional
 
-from langchain.docstore.document import Document
+try:
+    from langchain.docstore.document import Document
+except ModuleNotFoundError as me:
+    print(me.__str__())
+    from langchain.schema import Document
 
 from .logging import log_error
 from .llm.adapters import LLMRegistry