logstash create nested data

my data in logstash is

{ tid: '4',
  ct: '1',
  cst: '1',
  logExtra:
   [ { componentName: 'AIcon', count: 50 },
     { componentName: 'AFilter', count: 30 } ],
  createTime: '2020-12-11 16:18:00' }

i want my data logExtra field to elasticsearch is nested type， how can i do it ？
 
how to config logstash.conf