fix(vector-stores): log effective query when extra_body overrides it

When a caller passes a query inside extra_body, the outbound Vertex Search
request used that value but model_call_details recorded the original, so the
echoed search_query was stale. Log the effective query from the request body.

litellm/llms/vertex_ai/vector_stores/search_api/transformation.py

@@ -152,7 +152,9 @@ class VertexSearchAPIVectorStoreConfig(BaseVectorStoreConfig, VertexBase):
         if isinstance(extra_body, dict):
             request_body.update(extra_body)
 
-        litellm_logging_obj.model_call_details["query"] = query
+        litellm_logging_obj.model_call_details["query"] = request_body.get(
+            "query", query
+        )
 
         return url, request_body
 

tests/test_litellm/llms/vertex_ai/test_vertex_ai_search_vector_store_transformation.py

@@ -194,3 +194,16 @@ def test_search_request_joins_list_query():
     _, body = _search_request(query=["foo", "bar"])
 
     assert body["query"] == "foo bar"
+
+
+def test_search_request_logs_effective_query_when_extra_body_overrides_query():
+    log = SimpleNamespace(model_call_details={})
+
+    _, body = _search_request(
+        query="original",
+        extra_body={"query": "from-extra-body"},
+        litellm_logging_obj=log,
+    )
+
+    assert body["query"] == "from-extra-body"
+    assert log.model_call_details["query"] == "from-extra-body"