qdrant_client.http.exceptions.ResponseHandlingException: [Errno 9] Bad file descriptor

I'm making some parallel requests (~50/sec) to a qdrant server in a collection with the following config:

{
  "params": {
    "vectors": {
      "size": 2048,
      "distance": "Cosine",
      "on_disk": true
    },
    "shard_number": 1,
    "replication_factor": 1,
    "write_consistency_factor": 1,
    "on_disk_payload": true
  },
  "hnsw_config": {
    "m": 16,
    "ef_construct": 100,
    "full_scan_threshold": 10000,
    "max_indexing_threads": 0,
    "on_disk": false
  },
  "optimizer_config": {
    "deleted_threshold": 0.2,
    "vacuum_min_vector_number": 1000,
    "default_segment_number": 0,
    "max_segment_size": null,
    "memmap_threshold": null,
    "indexing_threshold": 20000,
    "flush_interval_sec": 5,
    "max_optimization_threads": 1
  },
  "wal_config": {
    "wal_capacity_mb": 32,
    "wal_segments_ahead": 0
  },
  "quantization_config": null
}

And I'm facing a huge delay in responses (4-40 seconds), and sometimes the following error:

search_result = self.client.search(
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/qdrant_client.py", line 324, in search
    return self._client.search(
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/qdrant_remote.py", line 454, in search
    search_result = self.http.points_api.search_points(
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api/points_api.py", line 1197, in search_points
    return self._build_for_search_points(
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api/points_api.py", line 536, in _build_for_search_points
    return self.api_client.request(
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api_client.py", line 74, in request
    return self.send(request, type_)
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api_client.py", line 91, in send
    response = self.middleware(request, self.send_inner)
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api_client.py", line 200, in __call__
    return call_next(request)
  File "/usr/local/lib/python3.8/dist-packages/qdrant_client/http/api_client.py", line 103, in send_inner
    raise ResponseHandlingException(e)
qdrant_client.http.exceptions.ResponseHandlingException: [Errno 9] Bad file descriptor

i guess that the problem is caused by "on_disk_payload": true, and "on_disk": true, but i'm not sure if this is the cause, and if it is, there is any way to change it without having to recreate and re populate the collection?

Start with qdrant_client/http/api_client.py, especially send and send_inner, then trace the request from qdrant_client/http/api/points_api.py through search_points. Reproduce the parallel-request case and identify what causes the bad file descriptor and response delays. Done means the cause, relevant configuration or code change, and any safe collection migration path are documented or covered by a regression test.