Logstash only insert fields in script

I am using Logstash to query MySQL database and insert its data to Elasticsearch cluster.
In my Elasticsearch output plugin I use a script like the following
script => 'if (ctx._source.nameslist== null){
ctx._source.nameslist= new ArrayList();
However logstash only inserts the field I use in the scripts and does not insert the other fields to my Elasticsearch. Is this normal? Do I have to add all the fields in the script? I have a lot of fields that I only want to insert them with no change.

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