How to create query which can calculate time difference?

Elastic Stack Elasticsearch
1

I have and index with following documents:

{name: 'Device1', type: 'start', 'eventTime': '2013-02-19 12:00:00'}
{name: 'Device2', type: 'start', 'eventTime': '2013-02-19 12:02:00'}
{name: 'Device1', type: 'stop', 'eventTime': '2013-02-19 12:45:00'}
{name: 'Device2', type: 'stop', 'eventTime': '2013-02-19 12:50:00'}

I would like to create a query which will return for me a new field with
time differences between eventTime's, faceted by device name and regards
with field type. For the example it should be:

{name: 'Device1', 'type': 'it really doesnt matter', eventTime: 'also doesnt matter', duration: '00:45:00'}
{name 'Device2', 'type': 'it really doesnt matter', eventTime: 'also doesnt matter', duration: '00:48:00'}

Is it possible with elastic search query language?

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