default ranker is set to BM25 instead of NULLRanker
default ranker is set to BM25 instead of NULLRanker

izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-lite,pombredanne/sf1r-lite,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-ad-delivery,pombredanne/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-lite,izenecloud/sf1r-ad-delivery,izenecloud/sf1r-lite,pombredanne/sf1r-lite,izenecloud/sf1r-lite