Update duckdb index files

.gitattributes

@@ -97,3 +97,4 @@ iwslt2017-it-nl/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-ro/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-zh/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-ja-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-nl-it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-nl-it/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5bb02f8f3d021438172048ba372da33564b79b51c9d51cc187f6b991789b36f9
+size 1060864