Fix hybrid_search to support EmbeddingList in request data (#3028)

- Add EmbeddingList import to grpc_handler.py
- Add automatic conversion of EmbeddingList to flat array in
hybrid_search
- Set is_embedding_list flag when EmbeddingList is detected
- This enables hybrid search to work with struct array vector fields

This fix aligns hybrid_search behavior with the regular search method,
which already supports EmbeddingList conversion.

Signed-off-by: zhuwenxing <[email protected]>

Author: zhuwenxing

pymilvus/client/grpc_handler.py

@@ -44,6 +44,7 @@
     is_legal_port,
 )
 from .constants import ITERATOR_SESSION_TS_FIELD
+from .embedding_list import EmbeddingList
 from .interceptor import _api_level_md
 from .prepare import Prepare
 from .search_result import SearchResult
@@ -997,17 +998,24 @@ def hybrid_search(
 
         requests = []
         for req in reqs:
+            # Convert EmbeddingList to flat array if present in the request data
+            data = req.data
+            req_kwargs = dict(kwargs)
+            if isinstance(data, list) and data and isinstance(data[0], EmbeddingList):
+                data = [emb_list.to_flat_array() for emb_list in data]
+                req_kwargs["is_embedding_list"] = True
+
             search_request = Prepare.search_requests_with_expr(
                 collection_name,
-                req.data,
+                data,
                 req.anns_field,
                 req.param,
                 req.limit,
                 req.expr,
                 partition_names=partition_names,
                 round_decimal=round_decimal,
                 expr_params=req.expr_params,
-                **kwargs,
+                **req_kwargs,
             )
             requests.append(search_request)