Update duckdb index files

.gitattributes

@@ -81,3 +81,4 @@ cs_de/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_fr/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_it/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_ja/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_ja/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d5dfce68b55f67629ad5ceaafff697f9f77ec34426db63fcd165207dba7b1af0
+size 157560832