Leveraging Fluentd Elastic Plugin with Elasticsearch 8.1.2 is returning ECONNREFUSED errors

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[x] read the contribution guideline
[ ] (optional) already reported 3rd party upstream repository or mailing list if you use k8s addon or helm charts.

Problem

When starting a Fluentd instance using this plugin, i was finding my fluentd instance to get ECONNREFUSED errors while using the security and certificates to validate and submit data to Elastic itself. I am using the most recent version of Elasticsearch, 8.1.2, which is new as this previously worked well when using an older version of Elastic. ...

Steps to replicate

git clone https://github.com/fallenreaper/secure-EFK
docker-compose -f docker-compose-security.yaml build fluentd
docker-compose -f docker-compose-security.yaml up -d
docker-compose -f docker-compose-security.yaml logs fluentd

Provide example config and message

Expected Behavior or What you need to ask

I wanted to have a solid how to on how to configure and set up this new version of elasticsearch with your existing software leveraging this plugin effectively. ...

Using Fluentd and ES plugin versions

OS version
- Docker Container: fluent/fluentd:v1.12-debian-1
- Host machine: Darwin 21.1.0
Bare Metal or within Docker or Kubernetes or others?
- Within Docker-Compose
Fluentd v0.12 or v0.14/v1.0
- fluentd 1.14.3
ES plugin 3.x.y/2.x.y or 1.x.y
```
*** LOCAL GEMS ***
```

async (1.29.0) async-http (0.54.0) async-io (1.32.1) async-pool (0.3.7) bigdecimal (default: 1.4.1) bundler (default: 1.17.2) cmath (default: 1.0.0) concurrent-ruby (1.1.9) console (1.12.0) cool.io (1.7.1) csv (default: 3.0.9) date (default: 2.0.0) dbm (default: 1.0.0) did_you_mean (1.3.0) e2mmap (default: 0.1.0) elasticsearch (7.16.1) elasticsearch-api (7.16.1) elasticsearch-transport (7.16.1) etc (default: 1.0.1) excon (0.89.0) ext_monitor (0.1.2) faraday (1.8.0) faraday-em_http (1.0.0) faraday-em_synchrony (1.0.0) faraday-excon (1.1.0) faraday-httpclient (1.0.1) faraday-net_http (1.0.1) faraday-net_http_persistent (1.2.0) faraday-patron (1.0.0) faraday-rack (1.0.0) fcntl (default: 1.0.0) fiber-local (1.0.0) fiddle (default: 1.0.0) fileutils (default: 1.1.0) fluent-plugin-elasticsearch (5.2.1, 5.1.4) fluent-plugin-secure-forward (0.4.5) fluentd (1.14.3, 1.12.4) forwardable (default: 1.2.0) gdbm (default: 2.0.0) http_parser.rb (0.8.0, 0.6.0) io-console (default: 0.4.7) ipaddr (default: 1.2.2) irb (default: 1.0.0) json (2.4.1, default: 2.1.0) logger (default: 1.3.0) matrix (default: 0.1.0) minitest (5.11.3) msgpack (1.4.2) multi_json (1.15.0) multipart-post (2.1.1) mutex_m (default: 0.1.0) net-telnet (0.2.0) nio4r (2.5.7) oj (3.10.18) openssl (default: 2.1.2) ostruct (default: 0.1.0) power_assert (1.1.3) prime (default: 0.1.0) protocol-hpack (1.4.2) protocol-http (0.21.0) protocol-http1 (0.13.2) protocol-http2 (0.14.2) proxifier (1.0.3) psych (default: 3.1.0) rake (12.3.3) rdoc (default: 6.1.2) resolv (0.2.1) resolve-hostname (0.1.0) rexml (default: 3.1.9.1) rss (default: 0.2.7) ruby2_keywords (0.0.5) scanf (default: 1.0.0) sdbm (default: 1.0.0) serverengine (2.2.4) shell (default: 0.7) sigdump (0.2.4) stringio (default: 0.0.2) strptime (0.2.5) strscan (default: 1.0.0) sync (default: 0.5.0) test-unit (3.2.9) thwait (default: 0.1.0) timers (4.3.3) tracer (default: 0.1.0) tzinfo (2.0.4) tzinfo-data (1.2021.5, 1.2021.1) webrick (default: 1.4.4) xmlrpc (0.3.0) yajl-ruby (1.4.1) zlib (default: 1.0.0)


* ES version (optional)  8.1.2
* ES template(s) (optional)

uken / fluent-plugin-elasticsearch