Update duckdb index files

.gitattributes

@@ -1070,3 +1070,4 @@ ar_ko/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar_pt/sampled_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 cs_de/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs_ja/test/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs_ja/test/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6fc7016f190b063cb05f43105a2ae6dcbe01d7eff583134560dc9c2b645ffc25
+size 26750976