Update duckdb index files

.gitattributes

@@ -109,3 +109,4 @@ 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/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-zh-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:48b0bd21ceb205868d44a845f177a228b674f1fa3bb56ef635925cf09e8cf827
+size 1060864