How to update index?

I have this output plugin in Logstash to create elastic search index.

output {
    amazon_es {
       hosts => ["https://xxxxxxxxxxxxxxxx.es.amazonaws.com/"]
       region => "ap-southeast-1"
       index => "studentservice-logs-%{+YYYY.MM.dd}"
   }
}

I want to update this index later because there will be some new fields added by mutate for some specific log messages.

How to update this index ?

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