Update duckdb index files

sugam11--covid-qa/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b080ddbb407e8210f0b0a9d1d195733da5628a945308eb907620ecaf329a124a
-size 45363200
+oid sha256:67e78cdbf25cd539251376d7fb368a84ab1ef15d3ae86e0d967840ffb98c0bdf
+size 45101056