GCP Vertex Search | Index deployed on Public Endpoint | Error while filtering based on Namespace

Question

We have deployed Vector Search index in batch mode on public endpoint in region US-Central1. It has datapoints with 'restricts' attribute.

We have code querying index deployed on GCP VM instance in same region US-Central1**. We are using aiplatform.MatchingEngineIndexEndpoint.match() method to filter based on namespace.

However it failing with below error. How can we fix this?

python3.9/site-packages/google/cloud/aiplatform/matching_engine/matching_engine_index_endpoint.py", line 1139, in match
    response = stub.BatchMatch(batch_request)
  File "/home/pravin_jade_accenture_com/vertexserach/vertexserachv/lib/python3.9/site-packages/grpc/_channel.py", line 1161, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/home/pravin_jade_accenture_com/vertexserach/vertexserachv/lib/python3.9/site-packages/grpc/_channel.py", line 1004, in _end_unary_response_blocking
    raise _InactiveRpcError(state)  # pytype: disable=not-instantiable
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
        status = StatusCode.UNAVAILABLE
        details = "DNS resolution failed for :10000: unparseable host:port"
        debug_error_string = "UNKNOWN:DNS resolution failed for :10000: unparseable host:port {grpc_status:14, created_time:"2023-11-02T11:40:59.484628703+00:00"}"

1. We have tried executing same code from Cloud Shell , Cloud VM in same GCP Region as well as Windows machine outside GCP. It throws same error as described in issue.
2. We tried using aiplatform_v1.MatchServiceClient.find_neighbors() method. However 'request' parameter to this method does not allow add filter on indexes to be searched. Are we missing something here?

We are expecting aiplatform.MatchingEngineIndexEndpoint.match() method invocation with optional parameter 'filter' to be successful and return matching vectors only.