Update duckdb index files

.gitattributes

@@ -106,3 +106,4 @@ fi_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 et_caselaw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 es_other/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 es_other/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+et_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

et_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:74029c0b255b18afffab03af7c9f4ca1d123e6fe8389f6449e58e532b0ab18f4
+size 28585984