Update duckdb index files

.gitattributes

@@ -68,3 +68,4 @@ 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-queries/dev/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nfcorpus-queries/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+nfcorpus-queries/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

nfcorpus-queries/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1f315e8569c0311e29c85d3fe02569a9ea04997151e3cc0933ea88fadaf735ac
+size 11808768