I am trying to get a result like the kibana "discover" tab like below
via date_histogram functionality
my request is as below
GET index-*/_search
{
"size": 0,
"aggs": {
"stats": {
"date_histogram": {
"min_doc_count": 0,
"missing": 0,
"time_zone": "+03:00",
"field": "@timestamp",
"fixed_interval": "1h",
"format": "yyyy-MM-dd HH:mm:ss"
}
}
},
"query": {
"bool": {
"filter": {
"range": {
"@timestamp": {
"format": "strict_date_optional_time",
"gte": "2022-08-01T11:00:00.000Z",
"lte": "2022-08-02T11:14:34.158Z"
}
}
}
}
}
}
resulting in correct query verifying from the number of total hits
{
"took": 4,
"timed_out": false,
"_shards": {
"total": 6,
"successful": 6,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 782,
"relation": "eq"
},
"max_score": null,
"hits": []
},
"aggregations": {
"stats": {
"buckets": [
{
"key_as_string": "2022-08-01 14:00:00",
"key": 1659351600000,
"doc_count": 450
},
{
"key_as_string": "2022-08-01 15:00:00",
"key": 1659355200000,
"doc_count": 265
},
...................................
{
"key_as_string": "2022-08-02 09:00:00",
"key": 1659420000000,
"doc_count": 0
},
{
"key_as_string": "2022-08-02 10:00:00",
"key": 1659423600000,
"doc_count": 31
},
{
"key_as_string": "2022-08-02 11:00:00",
"key": 1659427200000,
"doc_count": 0
},
{
"key_as_string": "2022-08-02 12:00:00",
"key": 1659430800000,
"doc_count": 1
}
]
}
}
}
the problem is that it does not return empty buckets that are in the end even if min_doc_count is set to 0. The number of buckets is 23 not 24 and only the last non-empty bucket is returned
If the last bucket is not empty then 24 are shown correctly. The in-between empty buckets are shown correctly to 0.
how can I fix my missing buckets ? Maybe its not possible with date_histogram ?
Thanks