Update duckdb index files

.gitattributes

@@ -504,3 +504,4 @@ welsh/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
 yoruba/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 yoruba/test/0000.parquet filter=lfs diff=lfs merge=lfs -text
 yoruba/validation/0000.parquet filter=lfs diff=lfs merge=lfs -text
+english/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

english/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8ac8799a9347005e7511b1a60f0b63c87aecf9c3a8a126a18635cfe5a3e37c56
+size 1671442432