Update duckdb index files

iwslt2017-en-ja/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:40aabe4e108f0360cef099041fb478eac0fc36bb8bd894595eaaf0438c2efe46
-size 33042432
+oid sha256:7e6c63c74d3cebbaa9c8cc32171f12c554b689150ad1c0c02b668072f8852988
+size 26750976