Update duckdb index files

.gitattributes

@@ -64,3 +64,4 @@ ZurichNLP--rsd-ists-2016/test_zh/index.duckdb filter=lfs diff=lfs merge=lfs -tex
 ZurichNLP--rsd-ists-2016/train_es/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ZurichNLP--rsd-ists-2016/train_fr/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ZurichNLP--rsd-ists-2016/train_ja/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ZurichNLP--rsd-ists-2016/train_ko/index.duckdb filter=lfs diff=lfs merge=lfs -text

ZurichNLP--rsd-ists-2016/train_ko/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:16463bc21c35ac431df09bf13a50a16e5ca020bf5205a6ec4803ef950989741d
+size 1585152