[BUG] Password set in OPENSEARCH_INITIAL_ADMIN_PASSWORD actually not used, OpenSearch uses the default password

[svok]

Describe the bug

I use docker-compose file with the following content:

  fluent-bit:
    container_name: fluent-bit
    image: fluent/fluent-bit
    ports:
      - "24224:24224"
      - "24224:24224/udp"
      - "2020:2020"
    environment:
      - opensearch_host=opensearch
      - opensearch_user=admin
      - opensearch_pass=admin # THIS IS WOERKING
#      - opensearch_pass=adm-Password0 # THIS IS NOT WORKING
    volumes:
      - ./volumes/fluent-bit-etc/fluent-bit.conf:/fluent-bit/etc/fluent-bit.conf
      - ./volumes/fluent-bit-etc/parsers.conf:/fluent-bit/etc/parsers.conf

  opensearch:
    container_name: opensearch
    image: opensearchproject/opensearch:latest
    environment:
      - discovery.type=single-node
      - http.port=9200
      - bootstrap.memory_lock=true
      - ES_JAVA_OPTS=-Xms512m -Xmx512m
      - OPENSEARCH_INITIAL_ADMIN_PASSWORD=adm-Password0
    ports:
      - '9200:9200'
      - '9600:9600'
    ulimits:
      memlock:
        soft: -1
        hard: -1
      nofile:
        soft: 65536
        hard: 65536
    volumes:
      - opensearch-data:/usr/share/opensearch/data

In this docker-compose I set OPENSEARCH_INITIAL_ADMIN_PASSWORD with 'adm-Password0' for OpenSearch. Fluentbit uses OpenSearch for disposing logs. But it doesn't work with password of OpenSearch. It works actually only with the default password 'admin'.

According to https://opensearch.org/blog/replacing-default-admin-credentials/ I have to use 'adm-Password0' indeed. But the test from this blog is not passing. It is getting passed if I use the default password 'admin'.

curl -ku admin:admin https://localhost:9200/_cluster/health?pretty
{
  "cluster_name" : "docker-cluster",
  "status" : "yellow",
  "timed_out" : false,
  "number_of_nodes" : 1,
  "number_of_data_nodes" : 1,
  "discovered_master" : true,
  "discovered_cluster_manager" : true,
  "active_primary_shards" : 45,
  "active_shards" : 45,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 37,
  "delayed_unassigned_shards" : 0,
  "number_of_pending_tasks" : 0,
  "number_of_in_flight_fetch" : 0,
  "task_max_waiting_in_queue_millis" : 0,
  "active_shards_percent_as_number" : 54.87804878048781
}

On the other hand, variable OPENSEARCH_INITIAL_ADMIN_PASSWORD is used indeed. If I remove it from the configuration I get the following error:

No custom admin password found. Please provide a password via the environment variable OPENSEARCH_INITIAL_ADMIN_PASSWORD.

Related component

Other

To Reproduce

1. Use above docker-compose to start OpenSearch
2. Use curl -ku admin:adm-Password0 https://localhost:9200/_cluster/health?pretty
3. See error

Expected behavior

OpenSearch should use password that is set via OPENSEARCH_INITIAL_ADMIN_PASSWORD variable. Requests with default password admin should cause 403 error.

Additional Details

Plugins By default in docker image of OpenSearch

Screenshots Not applicable

Host/Environment (please complete the following information):

• OS: Linux Ubuntu
• Version 20.04
• OpenSearch docker image 756d24015378
• OpenSearch version: 2.14.0
• Docker Compose version v2.27.0

Additional context Nothing special