Update duckdb index files

.gitattributes

@@ -200,3 +200,4 @@ dpr-first-40%-maxlen-150/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-35%-maxlen-150/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-35%-maxlen-150/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-35%-maxlen-150/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+dpr-first-35%-maxlen-500/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

dpr-first-35%-maxlen-500/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f918f71a1b8593e596d73c74e04a66263e59227b3a174f354edcd0be7b99644f
+size 8400896