Update duckdb index files

.gitattributes

@@ -64,3 +64,4 @@ es-en/partial-test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 es-en/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 fr-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ru-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+ru-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

ru-en/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:51fc71cfa6ea757cf395122d3eb6f633281bd0900d5eb92436671147bdd605dd
+size 1847296