Update duckdb index files

mathqa_other/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b547a48a0ea3056e49501980352fb226a43c1f2caac530185759dda408c9ed8a
-size 1323008
+oid sha256:54443ad0993e7798a39f4e43a33f9ab1867b7d5d01b3cbea84a68cebbaee3237
+size 1060864