How to convert a timestamp field to add a new field like "YYYY-MM-dd"

i need add a new field from a date filed
this date filed value is : 1465071797

$ date -d @1465071797
Sun Jun 5 04:23:17 CST 2016

the new field hope looks like "2016-06-05"

Use the date filter - https://www.elastic.co/guide/en/logstash/current/plugins-filters-date.html#plugins-filters-date-match