Update duckdb index files

.gitattributes

@@ -48,3 +48,4 @@ ar_en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_it/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_ko/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_ja/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_ja/sampled_validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5a1dc9512812082bb016f6b0bd78a51e5222d6ad89edcb0b867970eefe2dd326
+size 23867392