Update duckdb index files

.gitattributes

@@ -89,3 +89,4 @@ iwslt2017-it-ro/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-en-zh/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-it-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 iwslt2017-fr-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+iwslt2017-it-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

iwslt2017-it-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5d58798646bcc0f4e710dce53770dfb30c3b166406babcc31dd561f1c9c69563
+size 24915968