auto-interval date histogram: add response field that gives interval #32102
Description
As discussed in #28993, we want to specify the interval used in the aggregation so that clients don't have to dig into the buckets to infer the interval.
Here's an example
// Request
"sale_date" : {
"auto_date_histogram" : {
"field" : "timestamp"
}
}
// Response
"aggregations": {
"sale_date": {
// This is the field we will add
"interval": 1d,
"buckets": [{
"key_as_string": "2017-07-01T00:00:00.000Z",
"key": 1498867200000,
"doc_count": 124
}, {
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