Update duckdb index files

.gitattributes

@@ -1441,3 +1441,4 @@ zh_tr/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 zh_tr/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 zh_tr/sampled_validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_de/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ar_en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

ar_en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:39bbb3b56f3705a2d7e4691d1fb659ead2d4aa3df5c4a8a5aa43994aeee9d8c9
+size 253243392