Update duckdb index files

iwslt2017-ja-en/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:29ce1ea6874a60c2b406f94a3f357477183fe6a22fafcbb86bbcd2bbd0e38e28
-size 32518144
+oid sha256:9d39a78f95b52ad614562c800472b2ec11856fde8c761e983b0a8cd8013afbe8
+size 26750976