client fails to connect to self-managed Elasticsearch instance at https://localhost:9200 using all methods described in documentation

[jackgray]

Elasticsearch version (bin/elasticsearch --version):
8.7.1
elasticsearch-py version (elasticsearch.__versionstr__):
8.7.0
Please make sure the major version matches the Elasticsearch server you are running.
There is no python client version 8.7.1
Description of the problem including expected versus actual behavior:

Following documentation does not lead to successful python client connection.

https://www.elastic.co/guide/en/elasticsearch/client/python-api/current/connecting.html
https://github.com/elastic/elasticsearch/blob/8.13/docs/reference/setup/install/docker/docker-compose.yml

The cluster (single-node mode) otherwise behaves as expected.
curl -k -u username:password https://localhost:9200 succeeds:

{
  "name" : "es01",
  "cluster_name" : "elastic-cluster",
  "cluster_uuid" : "redacted",
  "version" : {
    "number" : "8.7.1",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "redacted",
    "build_date" : "2023-04-27T04:33:42.127815583Z",
    "build_snapshot" : false,
    "lucene_version" : "9.5.0",
    "minimum_wire_compatibility_version" : "7.17.0",
    "minimum_index_compatibility_version" : "7.0.0"
  },
  "tagline" : "You Know, for Search"
}

creating a fingerprint with openssl s_client -connect localhost:9200 -servername localhost -showcerts </dev/null 2>/dev/null | openssl x509 -fingerprint -sha256 -noout -in /dev/stdin succeeds

Initiation via python client does not:

client = Elasticsearch(
              "https://localhost:9200",
              # api_key="redacted==",     # base64
              # ca_certs="/opt/src/ca.crt",
             ssl_assert_fingerprint="redacted",
              basic_auth=('username', 'password')
            )
client.info()

Error:

elastic_transport.ConnectionError: Connection error caused by: ConnectionError(Connection error caused by: NewConnectionError(<elastic_transport._node._urllib3_chain_certs.HTTPSConnection object at 0x7fb6b2d2ba10>: Failed to establish a new connection: [Errno 111] Connection refused))

Steps to reproduce:

see above steps. Follow this guide to set up elastic stack: https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html, then this guide to connect with python client: https://www.elastic.co/guide/en/elasticsearch/client/python-api/current/connecting.html

Connection error occurs using API key, basic auth, verify_certs=True, verify_certs=False, mounting CA cert, and using CA fingerprint

[pquentin]

Hello, and sorry for the delay getting back to you.

This does not appear to be an HTTPS issue at all, "connection refused" means that the client cannot perform a TCP connection. Do you get a different error when using requests directly?

import requests
requests.get("https://localhost:9200")

Also please make sure to double check the host and port are correct.

[pquentin]

Closing as I've not heard back from you.