Update duckdb index files

.gitattributes

@@ -62,3 +62,4 @@ openbookqa/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 social_i_qa/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 winogrande/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 mbpp/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+natural_questions_parsed/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

natural_questions_parsed/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b2c09111ace1e3086eaafc7913fd7aa988e32bfcb3bdec0ab3b34d893fcb29c0
+size 1060864