Logstash output from filebeat. What is 'index' configuration option?

This is an excerpt taken from filebeat config for logstash output here

I'm wondering what does index have to do with logstash. In my logstash configuration itslef, if I redirect logs to ElasticSearch I believe my logs will be indexed under "logstash-%{+YYYY.MM.dd}" as the documentation says here.

So why is there an option to set index for filebeat's logstash output?

Yes, there is an index parameter. From the doc, if filebeat 7.5.0 send the data to logstash, the index would be filebeat-7.5.0.

output {
  elasticsearch {
    hosts => ["http://localhost:9200"]
    index => "%{[@metadata][beat]}-%{[@metadata][version]}" 

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