Update duckdb index files

.gitattributes

@@ -58,3 +58,4 @@ ar/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 all_languages/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 ar/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 en/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+en/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

en/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5c2a44e5bcf176ffd5fc3f9417229d3ababa83caea8d5e915a333b7ff9205b2b
+size 3944448