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Is your feature request related to a problem?

https://github.com/infiniflow/ragflow/issues/491

Describe the feature you'd like

Hope to support milvus, such as using bm25 and regular vector retrieval to implement existing methods.

Deepdoc is really great, but I really hope to support vector databases like milvus.

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response