fix docker compose issue (#238)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

Issue link:#[[Link the issue
here](https://github.com/infiniflow/ragflow/issues/226)]

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/nlp/search.py

@@ -46,7 +46,7 @@ class Dealer:
             "k": topk,
             "similarity": sim,
             "num_candidates": topk * 2,
-            "query_vector": qv
+            "query_vector": list(qv)
         }
 
     def search(self, req, idxnm, emb_mdl=None):