Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 tasksource--ecqa/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tasksource--ecqa/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 tasksource--ecqa/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b68b090e1a02c043c5750f3296f1aebe891dcdca258af207625cbb2d89c06c04
+size 8663040