Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ default/ja.stackoverflow.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/japanese.stackexchange.com/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/anime.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/ja.stackoverflow.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/japanese.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/japanese.stackexchange.com_simple/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:9f20c1df2d60d2b0490b15b5aa80d16cf1ad77d4e7f3632da3ba2fdee3b22ae6
+size 136327168