fix: Added trailing slash to gcs_prefix in from_batch_process_metadata()

Author: holtskinner

google/cloud/documentai_toolbox/wrappers/document.py

@@ -573,13 +573,21 @@ def from_batch_process_metadata(
         if metadata.state != documentai.BatchProcessMetadata.State.SUCCEEDED:
             raise ValueError(f"Batch Process Failed: {metadata.state_message}")
 
-        return [
-            Document.from_gcs(
-                *gcs_utilities.split_gcs_uri(process.output_gcs_destination),
-                gcs_input_uri=process.input_gcs_source,
+        documents: List[Document] = []
+        for process in metadata.individual_process_statuses:
+            gcs_bucket, gcs_prefix = gcs_utilities.split_gcs_uri(
+                process.output_gcs_destination
             )
-            for process in list(metadata.individual_process_statuses)
-        ]
+            documents.append(
+                Document.from_gcs(
+                    gcs_bucket_name=gcs_bucket,
+                    # Trailing slash added because it's missing from output_gcs_destination.
+                    # https://github.com/googleapis/python-documentai-toolbox/issues/271
+                    gcs_prefix=f"{gcs_prefix}/",
+                    gcs_input_uri=process.input_gcs_source,
+                )
+            )
+        return documents
 
     @classmethod
     def from_batch_process_operation(