Update duckdb index files

.gitattributes

@@ -61,3 +61,4 @@ Hindi/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 Hindi/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 English/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 English/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
+English/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

English/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a43d72393e32c6cf832b8cfb72e4d5535ada66c0ac5b7a917f395e2acecb6d74
+size 73412608