Provide the index codec configuration for logstash-output-amazon_es plugin

[snowmigrator]

Currently we can specify the "index.codec" parameter while creating an index or using template. For example:
PUT _template/log
{
"index_patterns": ["logs-*"],
"settings":{
"index.codec": "best_compression"
}
}

Can we provide the index settings (particularly the index.codec option) in logstash-output-amazon_es output? It should look something like this:

output {
amazon_es {
hosts => "<%= @es_endpoint %>"
region => "<%= @region %>"
index => "logs-%{+YYYY.MM.dd}"
index_settings => "codec="best_compression", number_of_replicas="2""
retry_max_interval => 30
retry_on_conflict => 3
}
}

The plugin in will create the index in any event so I was wondering why we can't provide index.codec option.

Thanks!