Update app.py

app.py

@@ -90,7 +90,10 @@ async def create_upload_file(text_field: str, file: UploadFile = File(...), ocr:
     # Imports
     import time
     from haystack import Document, Pipeline
-    from haystack.components.writers import DocumentWriter
+    from haystack.components.writers import DocumentWriter    
+    from haystack.components.preprocessors import DocumentSplitter, DocumentCleaner
+    from haystack.components.joiners import DocumentJoiner
+
     from haystack_integrations.components.retrievers.qdrant import QdrantHybridRetriever
     from haystack.document_stores.types import DuplicatePolicy
     from haystack_integrations.components.embedders.fastembed import (