Update duckdb index files

.gitattributes

@@ -1,3 +1,4 @@
 mteb--raw_medrxiv/json-train.parquet filter=lfs diff=lfs merge=lfs -text
 mteb--raw_medrxiv/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet 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 sha256:6900f5a666ba97453f4050c64c4a9b099e80655494beb7e2d54814b782a3fcaf
+size 101724160