How to convert string field into integer field in kibana

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So i am sending data of event viewer through winlogbeat to kibana. Actually my event_data.boottime value is coming in string format and i wanted this data field in number format. I have tried changing the format in winlogbeat.template.json but its not working.boot time field

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lrathod On

You need to make sure the mapping is defined correctly so that the data is automatically converted and save in required format by elastic.

"boot_time": {
    "type": "long"
}

You can check the current mapping of your type by using

http://elasticip:port/indexname/typename/_mapping