hi @LauraZ !!
The hybrid search is a fusion of the keyword search and the vector search.
When you provide the vector parameter, Weaviate will not vectorize the query for you. The query parameter will be used only for the keyword search phase.
If you do not provide the vector parameter, then Weaviate will vectorize it for you, considering you have a working vectorizer configured.
Check here for more information on that:
Let me know if this helps.
Thanks!