Hybrid search in weaviate

hi, I’m working with hybrid search in Weaviate and have a few questions that need clarification:

1. Is there a parameter to set a threshold value for hybrid search to filter out results with a minimum score? While I see the max_distance parameter, it appears to be specific to vector search.
2. How is the score calculated in hybrid search? My understanding is that it might use Reciprocal Rank Fusion (RRF), but I’d like confirmation on this.
3. How does the explainScore feature work in hybrid search? Since hybrid search combines keyword search and vector search, how does the explanation indicate whether the result is influenced by keyword search, vector search, or both?

Thank you in advance for your insights!