fix(rag): fix error in viewing document chunk and cannot start task_executor server (#3481)

### What problem does this PR solve?

1. Fix error in viewing document chunk

<img width="1677" alt="Pasted Graphic"
src="https://github.com/user-attachments/assets/acd84cde-f38c-4190-b135-5e5139ae2613">

Viewing document chunk details in a BeartypeCallHintParamViolation
error.

Traceback (most recent call last):
File "ragflow/.venv/lib/python3.12/site-packages/flask/app.py", line
880, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "ragflow/.venv/lib/python3.12/site-packages/flask/app.py", line
865, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
# type: ignore[no-any-return]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "ragflow/.venv/lib/python3.12/site-packages/flask_login/utils.py",
line 290, in decorated_view
return current_app.ensure_sync(func)(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "ragflow/api/apps/chunk_app.py", line 311, in knowledge_graph
sres = settings.retrievaler.search(req, search.index_name(tenant_id),
kb_ids)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<@beartype(rag.nlp.search.Dealer.search) at 0x3381fd800>", line
39, in search
beartype.roar.BeartypeCallHintParamViolation: Method
rag.nlp.search.Dealer.search() parameter
idx_names='ragflow_0e1e67f431d711ef98fc00155d29195d' violates type hint
list[str], as str 'ragflow_0e1e67f431d711ef98fc00155d29195d' not
instance of list.
2024-11-19 11:30:29,817 ERROR 91013 Method
rag.nlp.search.Dealer.search() parameter
idx_names='ragflow_0e1e67f431d711ef98fc00155d29195d' violates type hint
list[str], as str 'ragflow_0e1e67f431d711ef98fc00155d29195d' not
instance of list.
Traceback (most recent call last):
File "ragflow/api/apps/chunk_app.py", line 60, in list_chunk
sres = settings.retrievaler.search(query, search.index_name(tenant_id),
kb_ids, highlight=True)

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "<@beartype(rag.nlp.search.Dealer.search) at 0x3381fd800>", line
39, in search
beartype.roar.BeartypeCallHintParamViolation: Method
rag.nlp.search.Dealer.search() parameter
idx_names='ragflow_0e1e67f431d711ef98fc00155d29195d' violates type hint
list[str], as str 'ragflow_0e1e67f431d711ef98fc00155d29195d' not
instance of list.


because in nlp/search.py,the idx_names is only list

<img width="1098" alt="Pasted Graphic 2"
src="https://github.com/user-attachments/assets/4998cb1e-94bc-470b-b2f4-41ecb5b08f8a">

but the DocStoreConnection.search method accept list or str
<img width="1175" alt="Pasted Graphic 3"
src="https://github.com/user-attachments/assets/ee918b4a-87a5-42c9-a6d2-d0db0884b875">


and his implements also list and str
es_conn.py

<img width="1121" alt="Pasted Graphic 4"
src="https://github.com/user-attachments/assets/3e6dc030-0a0d-416c-8fd4-0b4cfd576f8c">

infinity_conn.py

<img width="1221" alt="Pasted Graphic 5"
src="https://github.com/user-attachments/assets/44edac2b-6b81-45b0-a3fc-cb1c63219015">

2. Fix cannot star task_executor server with Unresolved reference
'Mapping'
<img width="1283" alt="Pasted Graphic 6"
src="https://github.com/user-attachments/assets/421f17b8-d0a5-46d3-bc4d-d05dc9dfc934">

### Type of change

- [X] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

rag/nlp/search.py

@@ -61,7 +61,7 @@ class Dealer:
                 condition[key] = req[key]
         return condition
 
-    def search(self, req, idx_names: list[str], kb_ids: list[str], emb_mdl=None, highlight = False):
+    def search(self, req, idx_names: str | list[str], kb_ids: list[str], emb_mdl=None, highlight = False):
         filters = self.get_filters(req)
         orderBy = OrderByExpr()