I want to set up the initial password without any environment variables after "xpack.security.enabled: true"

Hi there.
I'm trying to use T-Pot with "xpack.security.enabled: true".

I want to set up passwords for Elasticsearch's built-in users (elastic, kibana_system, and so on) as following conditions.

  1. Use as few interactive or prompting procedures as possible.
  2. Environment variables are not available. (See this article)

I applied "File-based user authentication" and got the following.

# cd /data/elk
# cat ./users <<<created beforehand with the elasticsearch-users command.
# cat ./users_roles
# cat /opt/tpot/etc/tpot.yml <<<created beforehand
     - /data:/data
     - /data/elk/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
     - /data/elk/users:/usr/share/elasticsearch/config/users
     - /data/elk/users_roles:/usr/share/elasticsearch/config/users_roles
# systemctl stop tpot
# systemctl start tpot
# curl -u tpotsuper:tpotsuper -X POST "localhost:64298/_security/user/elastic/_password" -H 'Content-Type: application/json' -d '{"password": "elastic_password"}'
# curl -u elastic:elastic_password http://localhost:64298/
  "name" : "tpotcluster-node-01",
  "cluster_name" : "tpotcluster",
  "cluster_uuid" : "CUF8YNVTThm8QqKvWeeXGg",
  "version" : {
    "number" : "7.15.1",
    "build_flavor" : "default",
    "build_type" : "tar",
    "build_hash" : "83c34f456ae29d60e94d886e455e6a3409bba9ed",
    "build_date" : "2021-10-07T21:56:19.031608185Z",
    "build_snapshot" : false,
    "lucene_version" : "8.9.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  "tagline" : "You Know, for Search"
# systemctl stop tpot
# rm /data/elk/users
# rm /data/elk/users_roles
# touch /data/elk/users <<<replace with empty file
# touch /data/elk/users_roles
# systemctl start tpot

Is there a simpler way?

Is this the simplest way with conditions in this post?

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