Update duckdb index files

.gitattributes

@@ -65,3 +65,4 @@ ZurichNLP--rsd-ists-2016/train_es/index.duckdb filter=lfs diff=lfs merge=lfs -te
 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_zh/index.duckdb filter=lfs diff=lfs merge=lfs -text

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

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:358de9604300dd215a552f0d5fb99ad2c4a3a099ddc91cbe198ec6600bfab3bd
+size 1585152