Update duckdb index files

.gitattributes

@@ -432,3 +432,4 @@ default/ig.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ig.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/be.train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/it.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/ja.validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/ja.validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3d0f126a362e0fc2800b544eb41ff8c6326a3d02fc505ca2a93b9dc79f62d63b
+size 3420160