Fluentd DaemonSet failed to flush the buffer sending to Opensearch cluster with undefined error

[pashtet04]

Steps to replicate

match configured to send container logs from Kubernetes Fluentd DaemonSet to secured Opensearch 1.3.2 with config

        <match kube.var.log.containers.**>
          @type opensearch
          hosts "#{ENV['DP_ELASTICSEARCH_HOSTS']}"
          port "#{ENV['DP_ELASTICSEARCH_PORT']}"
          scheme "#{ENV['DP_ELASTICSEARCH_SCHEME']}"
          user "#{ENV['DP_ELASTICSEARCH_USER']}"
          password "#{ENV['DP_ELASTICSEARCH_PASSWORD']}"
          index_name dev
          request_timeout 30s
          suppress_type_name true
          reconnect_on_error true
          reload_on_failure true
          reload_connections false
          ssl_verify false
          <buffer tag>
            timekey 1h
            flush_mode interval
            flush_interval 60s
            retry_wait 1.0
          </buffer>
        </match>

And fluentd got an error and no logs send:

2022-05-22 19:27:31 +0000 [warn]: #0 failed to flush the buffer. retry_times=0 next_retry_time=2022-05-22 19:27:33 +0000 chunk="5df9eb36ea559fe9862c44aff9c51945" error_class=Fluent::Plugin::OpenSearchOutput::RecoverableRequestFailure error="could not push logs to OpenSearch cluster ({:host=>\"HOST1\", :port=>9200, :scheme=>\"https\", :user=>\"fluentd\", :password=>\"obfuscated\"}, {:host=>\"HOST2\", :port=>9200, :scheme=>\"https\", :user=>\"fluentd\", :password=>\"obfuscated\"}, {:host=>\"HOST3\", :port=>9200, :scheme=>\"https\", :user=>\"fluentd\", :password=>\"obfuscated\"}): undefined methodcall' for nil:NilClass"
`

Expected Behavior or What you need to ask

No undefined errors in logs
Events/logs sends from Fluentd DaemonSet to the Opensearch cluster

Using Fluentd and OpenSearch plugin versions

• fluent/fluentd-kubernetes-daemonset:v1.14.6-debian-opensearch-1.0

• Kubernetes

• fluentd 1.14.6

• OpenSearch plugin version
  fluent-plugin-opensearch (1.0.3)
  opensearch-api (1.0.0)
  opensearch-ruby (1.0.0)
  opensearch-transport (1.0.0)
  fluent-config-regexp-type (1.0.0)
  fluent-plugin-concat (2.5.0)
  fluent-plugin-detect-exceptions (0.0.14)
  fluent-plugin-grok-parser (2.6.2)
  fluent-plugin-json-in-json-2 (1.0.2)
  fluent-plugin-kubernetes_metadata_filter (2.9.5)
  fluent-plugin-multi-format-parser (1.0.0)
  fluent-plugin-opensearch (1.0.3)
  fluent-plugin-parser-cri (0.1.1)
  fluent-plugin-prometheus (2.0.2)
  fluent-plugin-record-modifier (2.1.0)
  fluent-plugin-rewrite-tag-filter (2.4.0)
  fluent-plugin-systemd (1.0.5)
  fluentd (1.14.6)

• OpenSearch version 1.3.2

[sdwerwed]

Probably duplicate of #42 ?

[pashtet04]

seems to be