Update duckdb index files

.gitattributes

@@ -550,3 +550,4 @@ default/lt.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ru.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/tt.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ug.test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/rw.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/rw.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:33da30433a019ebe65257b42630473664d6da4eadd7b1be0655c3afa77227487
+size 12857344