Update duckdb index files

.gitattributes

@@ -63,3 +63,4 @@ anime.stackexchange.com/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 anime.stackexchange.com_simple/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ja.stackoverflow.com/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ja.stackoverflow.com_simple/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+japanese.stackexchange.com/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

japanese.stackexchange.com/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cdccd71e88d2362b3557d04ecf5c08d91905b345aeb63b4a3987ef6d8592d495
+size 132395008