Update duckdb index files

.gitattributes

@@ -278,3 +278,4 @@ indonesian/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 indonesian/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 japanese/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 indonesian/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+japanese/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

japanese/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2e24ae3f1505d826da1751cf66519f04535676213829fb18203283cfe066195f
+size 4206592