Update duckdb index files

.gitattributes

@@ -96,3 +96,4 @@ NaturalQuestions-qrels/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nq-hard/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ConditionalQA-corpus/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 nq-hard/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+NaturalQuestions-corpus/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

NaturalQuestions-corpus/{train → test}/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7c12f12e6a2d1b608c7f08514e300ceaccc8a270f8016f318acc0a171d762c73
-size 2340171776
+oid sha256:bcef845b680f64fbb01bcff62e0533b00411498952d59e664030081cfb5a4ca5
+size 2330996736