Update duckdb index files

.gitattributes

@@ -26,3 +26,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zstandard filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
 cs-en/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
+cs-en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

cs-en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:43e2095ee9a695e2945c8f21aa4cabd3cb22b26b506b5da7efb9df56ee40f5b0
+size 182988800