Update duckdb index files

.gitattributes

@@ -108,3 +108,4 @@ iwslt2017-ro-nl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-nl/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-zh-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ro-nl/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-zh-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-zh-en/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b05e3cb1a191a18d003e403165963ed888b8393f58a7b8cb6a765cefbc1a26e5
+size 1847296