Update duckdb index files

.gitattributes

@@ -96,3 +96,4 @@ iwslt2017-it-en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 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-ja-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c5a78491599465ea4f3c9f9b3340da894804fa75f103e660ddedf84b512537dc
+size 1060864