Update duckdb index files

.gitattributes

@@ -56,3 +56,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 default/test/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+eurovoc_concepts/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

eurovoc_concepts/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ad83b67b6e97629f243dcebc86c6f7a95fb70ae2ce88fab3d8742f475cf9389c
+size 1323008