expand example to use bytestream (#6718)

examples/pipelines/indexing_pipeline_with_meta.py

@@ -1,8 +1,10 @@
 from typing import Dict, Any
 from pathlib import Path
 from datetime import datetime
+import os
 
 from haystack import Pipeline
+from haystack.dataclasses import ByteStream
 from haystack.components.others import Multiplexer
 from haystack.components.converters import PyPDFToDocument, TextFileToDocument
 from haystack.components.preprocessors import DocumentCleaner, DocumentSplitter
@@ -34,9 +36,20 @@
 p.connect("cleaner.documents", "splitter.documents")
 p.connect("splitter.documents", "writer.documents")
 
+# Add metadata to your files by using ByteStream
+sources = []
+for position, path in enumerate(list(Path(".").iterdir())):
+    if path.is_file():
+        # Create the ByteStream
+        source = ByteStream.from_file_path(path)
+        # Add the metadata
+        source.meta["path"] = path
+        source.meta["position"] = position
+        sources.append(source)
+
 result = p.run(
     {
-        "file_type_router": {"sources": list(Path(".").iterdir())},
+        "file_type_router": {"sources": sources},
         "metadata_multiplexer": {"value": {"date_added": datetime.now().isoformat()}},
     }
 )