Opensearch Failed to set number of replicas due no permissions - opensearch

Question

I have the problem with running index managment policy for new indices. I get following error on "set number_of_replicas" step:
{
"cause": "no permissions for [indices:admin/settings/update] and associated roles [index_management_full_access, own_index, security_rest_api_access]",
"message": "Failed to set number_of_replicas to 2 [index=sample.name-2022.10.22]"
}
The indices are created by logstash with "sample.name-YYYY.MM.DD" name template, so in the index policy I have "sample.name-*" index pattern.
My policy:
{
"policy_id": "sample.name-*",
"description": "sample.name-* policy ",
"schema_version": 16,
"error_notification": null,
"default_state": "set replicas",
"states": [
{
"name": "set replicas",
"actions": [
{
"replica_count": {
"number_of_replicas": 2
}
}
]
],
"ism_template": [
{
"index_patterns": [
"sample.name-*"
],
"priority": 1
}
]
}
I don't understand the reason of this error.
Am I doing something wrong?
Retry of the policy doesn't work.
The policy works only if I manually reassign it to index by Dashboards or API.
Opensearch version: 2.3.0

Answer 1

First time I created the policy using API under custom internal user with mapped “security_rest_api_access” security role only.
So I added all_access rights to my internal user and re-created policy and it works!
Seems that the policy runs under my internal user, which created it