SPARSE_FLOAT_VECTOR is not support metric_type="BM25"

[Galaxy0505]

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Issue

SPARSE_FLOAT_VECTOR is not support metric_type="BM25"，[handler]: RPC error: [create_index], <MilvusException: (code=1100, message=only IP is the supported metric type for sparse index: invalid parameter[expected=valid index params][actual=invalid index params])>, <Time:{'RPC start': '2025-01-15 18:59:05.468730', 'RPC error': '2025-01-15 18:59:05.581485'}> (decorators.py:140)

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[zhengbuqian]

Hi @Galaxy0505, BM25 metric is supported at Milvus 2.5 or later, and can be used only on sparse vector field that is the output of BM25 function. See https://github.com/milvus-io/pymilvus/blob/master/examples/datatypes/hello_bm25.py for example