Multiple interface sniffing with packetbeat & output to 1 file

Hello - I have packetbeat version 7.10 installed on Linux (RHEL Centos 7) server. I've configured packetbeat to listen on two interfaces. I was able to calculate this by using the command packetbeat devices command. Everything is working as expected and data is being generated.

  1. Is it correct to configure packetbeat to listen on multiple interfaces like below and capture traffic from both interfaces into a single output file?

  2. How can i distinguish between data that is coming from interface 0 vs interface 1?

packetbeat.interfaces.device: 0
packetbeat.interfaces.device: 1
packetbeat.interfaces.type: pcap

path: "/home/user/packetbeat/"
filename: packetbeat.jsonl