Update duckdb index files

.gitattributes

@@ -206,3 +206,4 @@ dpr-first-35%-maxlen-500/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-5%-maxlen-400/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-5%-maxlen-400/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 dpr-first-5%-maxlen-400/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+dpr-first-5%-maxlen-500/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

dpr-first-5%-maxlen-500/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:fcbc86af2de61ad71913e0ba9716c380a564ce8607656bf9171b21f1fc08c2b4
+size 4993024