Log index creation

eurostat_to_dbnomics.py

@@ -428,6 +428,7 @@ def main():
             "\t".join([dataset_code, dataset_tree_id, dataset_blob_id])
             for dataset_code, (dataset_tree_id, dataset_blob_id) in dataset_pair_by_dataset_code.items()
         )
+    log.info("Datasets index file written: %s", dataset_index_file_path)
 
     if not args.no_commit:
         categories_tree_json_blob = Blob.from_string(