Update duckdb index files

.gitattributes

@@ -61,3 +61,4 @@ default/ja.stackoverflow.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -
 default/japanese.stackexchange.com_simple/index.duckdb filter=lfs diff=lfs merge=lfs -text
 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/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:48d1bda02d2eba7e156fc1b69eee369d165422c5f79de968a30c8a80cee7104c
+size 198455296