Update duckdb index files

.gitattributes

@@ -57,3 +57,4 @@ default/lexicon_train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/lexicon_valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/sentence_test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/sentence_valid/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/sentence_train/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/sentence_train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:de5b04cb9509188a3bdea0b3472047750c296f8d23e688c36d546b4e71e7a37e
+size 29110272