Update duckdb index files

.gitattributes

@@ -62,3 +62,4 @@ hotpotqa.original-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -t
 hotpotqa.original-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hotpotqa.random-split/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 hotpotqa.random-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+naturalquestions.original-split/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

naturalquestions.original-split/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:80b9b9e6ce6c3de9a9f262254e0cb575eb253464f29ab984715a97bea1402202
+size 119549952