Update duckdb index files

.gitattributes

@@ -5,3 +5,4 @@ BeIR--fever-qrels/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 BeIR--fever-qrels/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/train/0000.parquet filter=lfs diff=lfs merge=lfs -text
 default/test/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:eb41b3e36b80a53682eff4a6294ad7d1b73f0b3baa54e572c97ade23b5278141
+size 5255168