FuentD Rollover alias for AWS OpenSearch ILM - alias

Question

I have logging infrastructure setup with AWS OpenSearch, Fluent-bit (DaemonSet on EKS), FluentD (Deployment on EKS) and OpenSearch Dashboard.
I am working on the ILM policy and facing issue with the rollover. I am trying to achieve with the policy, after reaching the condition (after every 1 days or when the index reaches size 2G), the rollover should happen and moved to cold storage. Once the old index reaches 7 days in total, the old index should get deleted.
My FluentD config:
<match *.**>
#type copy
<store>
type elasticsearch
include_tag_key true
host "#{ENV.fetch('ELASTICSEARCH_HOST')}"
port "#{ENV.fetch('ELASTICSEARCH_PORT')}"
user "#{ENV.fetch('ELASTICSEARCH_USER')}"
password "#{ENV.fetch('ELASTICSEARCH_PASSWORD')}"
log_es_400_reason true
ca_file /certs/ca.pem
scheme https
ssl_verify true
logstash_format true
logstash_prefix rollover-sbx
</match>
ILM policy
{
"id": "sbx-ism-policy",
"seqNo": 379851,
"primaryTerm": 2,
"policy": {
"policy_id": "sbx-ism-policy",
"description": "A simple default policy that changes the replica count between hot and cold states.",
"last_updated_time": 1650595677042,
"schema_version": 12,
"error_notification": null,
"default_state": "hot",
"states": [
{
"name": "hot",
"actions": [
{
"rollover": {
"min_size": "200mb",
"min_doc_count": 200,
"min_index_age": "1h"
}
}
],
"transitions": [
{
"state_name": "cold",
"conditions": {
"min_index_age": "1h"
}
}
]
},
{
"name": "cold",
"actions": [
{
"close": {}
}
],
"transitions": []
}
],
"ism_template": [
{
"index_patterns": [
"rollover-sbx*"
],
"priority": 70,
"last_updated_time": 1650583513796
}
]
}
}
above mentioned min size and time in ILM policy are for testing purpose