Update duckdb index files

.gitattributes

@@ -51,3 +51,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
 allenai--ms2_dense_mean/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 allenai--ms2_dense_mean/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+allenai--ms2_dense_mean/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

allenai--ms2_dense_mean/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:636801201af6c147c044ca053ac12cd4ed53c0468994ba63a98956dc1b114e3a
+size 1081356288