Environment variable of type array isn't accepted in logstash elasticsearch output plugin

Hi,

I'm trying to output to elasticsearch using logstash and specifying hosts as environment variable is not working.

I see there's any issue as per this link https://github.com/elastic/logstash/issues/6366
I'd like to know if there's an workaround

#declaring env. variable
export HOSTS='["10.2.0.6","10.2.0.7","10.2.0.8"]'

Sample logstash conf file to show how hosts is declared

input {
}
filter {
}
output {
elasticsearch {

	hosts => ${HOSTS}

}	

}

can someone reply on this .. thanks

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