Update duckdb index files

.gitattributes

@@ -82,3 +82,4 @@ en_legislation/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 da_wikipedia/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 el_caselaw/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text
 el_other/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+en_contracts/validation/index.duckdb filter=lfs diff=lfs merge=lfs -text

en_contracts/validation/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0fccd018c8f7deae6b80e1528074e413e9ab72bc49ddacb11ae7c658b0e14603
+size 50081792