How to use multiple index under logstash output in filebeat

Elastic Stack Logstash
1

I want to send same data to two index under logstash output.

FYR my filebeat.yml (Logstash output)
##################
output.logstash:
enabled: true
hosts: ["IP:Port"]
index: 'common'
##################

how to mention multiple index inside this logstash output?

2

You can't configure this on the Filebeat side. You'll have to update your Logstash configuration to include multiple elasticsearch outputs.