[BUG] - Unable to set environment variable for opensearch_dashboards.yml settings which contain underscores in their name

Describe the bug

I'm trying to deploy OpenSearch without multitenancy. The setting for this in opensearch_dashboards.yml is: opensearch_security.multitenancy.enabled

In the Installation Documentation it says: "If you override opensearch_dashboards.yml settings using environment variables in your compose file, use all uppercase letters and replace periods with underscores (for example, for opensearch.hosts, use OPENSEARCH_HOSTS). This behavior is inconsistent with overriding opensearch.yml settings, where the conversion is just a change to the assignment operator (for example, discovery.type: single-node in opensearch.yml is defined as discovery.type=single-node in docker-compose.yml)."

However, when I tried deploying opensearch with OPENSEARCH_SECURITY_MUTITENANCY_ENABLED: false it still deployed with multitenancy enabled.

To Reproduce Steps to reproduce the behavior:

Deploy opensearch using docker compose with the following additions: environment:
- OPENSEARCH_HOSTS: '["https://opensearch-node1:9200/","https://opensearch-node2:9200/"]' # Define the OpenSearch nodes that OpenSearch Dashboards will query
- OPENSEARCH_SECURITY_MUTITENANCY_ENABLED: false
- OPENSEARCH_SECURITY_MUTITENANCY_TENANTS_PREFERRED: ["Global"] networks:
- opensearch-net
The settings do not take once deployed

Expected behavior OpenSearch will deploy with multitenancy disabled.

OpenSearch Version 2.13

Dashboards Version 2.13

Plugins Logstash

Screenshots

If applicable, add screenshots to help explain your problem.

Host/Environment (please complete the following information):

OS: SLES 15 SP4
Browser and version [e.g. 22]: Edge 124.0.2478.51

Additional context

Add any other context about the problem here.

opensearch-project / OpenSearch-Dashboards

[BUG] - Unable to set environment variable for opensearch_dashboards.yml settings which contain underscores in their name #6677