Update duckdb index files

.gitattributes

@@ -65,3 +65,4 @@ nfcorpus-qrels/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hotpotqa-queries/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nfcorpus-qrels/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hotpotqa-queries/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+nfcorpus-corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

nfcorpus-corpus/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f3bbecd6820941002a47bd1f79868e4779541c01f0dbc1e3d870271be82620a5
+size 28061696