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
 nell_candidate/partial-train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+nell_belief_sentences/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

nell_belief_sentences/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3c2db583b6f08aa6b0d2d67802520b2f92f5f4f65ccb0ac4297fd839e0c3f7cf
+size 5642661888