ElasticSearch Date Histogram Aggregation considering dates within a Document range - elasticsearch

Question

I'm working with documents in Elasticsearch that represent Alerts. These Alerts are activated for a time and then deactivated. They are similar to this schema.
{
"id": 189393,
"sensorId": "1111111",
"activationTime": 1462569310000,
"deactivationTime": 1462785524876,
}
I would like to know the number of active alerts per day. To achieve this I want to perform a Date Histogram Aggregation that returns the days between activation and deactivation and the number of active alerts per day.
What I've tried so far is this query.
{
"query" : {
...
},
"aggs": {
"active_alerts": {
"date_histogram": {
"field": "timestamp",
"interval": "day"
}
}
}
}
However, It returns just the day it was activated.
"aggregations": {
"active_alerts": {
"buckets": [
{
"key_as_string": "2016-05-06T00:00:00.000Z",
"key": 1462492800000,
"doc_count": 1
}
]
}
}
Which I'd like ​​to return are the days between activation and deactivation time and the number of active alerts per day, as shown below.
"aggregations": {
"active_alerts": {
"buckets": [
{
"key_as_string": "2016-05-06T00:00:00.000Z",
"key": 1462492800000,
"doc_count": 1
},
{
"key_as_string": "2016-05-07T00:00:00.000Z",
"key": 1462579200000,
"doc_count": 1
},
{
"key_as_string": "2016-05-08T00:00:00.000Z",
"key": 1462665600000,
"doc_count": 1
}
]
}
}
Thanks.

Answer 1

Finally I've found a solution via script, creating one that emits an array of dates from activation date until deactivation date.
"aggs": {
"active_alerts": {
"date_histogram": {
"interval": "day",
"script": "Date d1 = new Date(doc['activationTime'].value); Date d2 = new Date(doc['deactivationTime'].value); List<Date> dates = new ArrayList<Date>(); (d1..d2).each { date-> dates.add(date.toTimestamp().getTime())}; return dates;"
}
}
}
Thanks.

Answer 2

I think you can only do it with scripted dateHistogram where you add the "missing" days from that interval you have programmatically:
"aggs": {
"active_alerts": {
"date_histogram": {
"interval": "day",
"script": "counter=0;combinedDates=[];currentDate=doc.activationTime.date;while(currentDate.isBefore(doc.deactivationTime.date.getMillis())){combinedDates[counter++]=currentDate.getMillis();currentDate.addDays(1)};combinedDates[counter]=doc.deactivationTime.date.getMillis();return combinedDates"
}
}
}