Update duckdb index files

iwslt2017-ja-en/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:cfde10a865cd8adf046c825d7381e5fa268d914ed26d5aff7effcc6b64bc1e8d
-size 26750976
+oid sha256:29ce1ea6874a60c2b406f94a3f357477183fe6a22fafcbb86bbcd2bbd0e38e28
+size 32518144