[QUESTION]: 使用search方法时，output_fields参数无效

[LiAI-tech]

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我在collection里定义了字符串类型的字段，向量检索时希望将此字段的值一并返回，查询时不报错，但返回结果中只有ids和distance两个字段

Anything else?

results = collection.search( data=[[0.1, 0.2]], anns_field="book_intro", param=search_params, output_fields = ["book_id", "book_name"], limit=10, expr=None, consistency_level="Strong" )