Update duckdb index files

.gitattributes

@@ -35,3 +35,4 @@ ar_de/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_en/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_es/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_cs/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_cs/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:838c9971a7cd3e9dbade32690594a83cc77a982f756c9eb8ea04f3edc27ad0b8
+size 150482944