diff --git a/jina/serve/runtimes/worker/batch_queue.py b/jina/serve/runtimes/worker/batch_queue.py
index 530f5f58d3a81..8f7e0d283b413 100644
--- a/jina/serve/runtimes/worker/batch_queue.py
+++ b/jina/serve/runtimes/worker/batch_queue.py
@@ -23,6 +23,7 @@ def __init__(
         response_docarray_cls,
         output_array_type: Optional[str] = None,
         params: Optional[Dict] = None,
+        flush_all: bool = False,
         preferred_batch_size: int = 4,
         timeout: int = 10_000,
     ) -> None:
@@ -35,6 +36,7 @@ def __init__(
         self.params = params
         self._request_docarray_cls = request_docarray_cls
         self._response_docarray_cls = response_docarray_cls
+        self._flush_all = flush_all
         self._preferred_batch_size: int = preferred_batch_size
         self._timeout: int = timeout
         self._reset()
@@ -205,7 +207,10 @@ async def _assign_results(
 
             return num_assigned_docs
 
-        def batch(iterable_1, iterable_2, n=1):
+        def batch(iterable_1, iterable_2, n:Optional[int] = 1):
+            if n is None:
+                yield iterable_1, iterable_2
+                return
             items = len(iterable_1)
             for ndx in range(0, items, n):
                 yield iterable_1[ndx : min(ndx + n, items)], iterable_2[
@@ -229,7 +234,7 @@ def batch(iterable_1, iterable_2, n=1):
                 non_assigned_to_response_request_idxs = []
                 sum_from_previous_first_req_idx = 0
                 for docs_inner_batch, req_idxs in batch(
-                    self._big_doc, self._request_idxs, self._preferred_batch_size
+                    self._big_doc, self._request_idxs, self._preferred_batch_size if not self._flush_all else None
                 ):
                     involved_requests_min_indx = req_idxs[0]
                     involved_requests_max_indx = req_idxs[-1]
diff --git a/jina/serve/runtimes/worker/http_fastapi_app.py b/jina/serve/runtimes/worker/http_fastapi_app.py
index fd4aeabf8c79c..b45b94f7c62cf 100644
--- a/jina/serve/runtimes/worker/http_fastapi_app.py
+++ b/jina/serve/runtimes/worker/http_fastapi_app.py
@@ -7,6 +7,7 @@
 from jina.serve.networking.sse import EventSourceResponse
 from jina.types.request.data import DataRequest
 
+
 if TYPE_CHECKING:
     from jina.logging.logger import JinaLogger
 
@@ -88,7 +89,6 @@ def add_post_route(
 
         @app.api_route(**app_kwargs)
         async def post(body: input_model, response: Response):
-
             req = DataRequest()
             if body.header is not None:
                 req.header.request_id = body.header.request_id
@@ -122,7 +122,9 @@ async def post(body: input_model, response: Response):
                     docs_response = resp.docs.to_dict()
                 else:
                     docs_response = resp.docs
+
                 ret = output_model(data=docs_response, parameters=resp.parameters)
+
                 return ret
 
     def add_streaming_routes(