Elasticsearch: get the max and min value form a specific object of a maps of objects - json

Question

I has this mapping for the índex on elastic, i was try to get the max value of a day for a specific sensor, but my query get the value of all the sensors.
"sensor": {
"type": "nested",
"properties": {
"type": {
"type": "integer"
},
"name": {
"type": "keyword"
},
"number": {
"type": "integer"
},
"values": {
"type": "nested",
"properties": {
"type": {
"type": "text"
},
"value": {
"type": "float"
},
"unit": {
"type": "text"
},
"Lmin": {
"type": "float"
},
"Lmax": {
"type": "float"
}
}
}
}
An this is the map of objects,
I need only the max and the min value of the las day from the sensor number 13, i try it but ever i get the max of all sensors.
{"query": {
"nested": {
"path": "sensor",
"query": {
"nested": {
"path": "sensor.values",
"query": {
"bool": {
"must": [
{
"match": {
"sensor.values.type": "TEMPERATURE"
}
}
]
}
}
}
}
}
},
"aggs": {
"agg_by_type": {
"nested": {
"path": "sensor.values"
},
"aggs": {
"max_value": {
"max": {
"field": "sensor.values.value"
}
}
}
}
}
}
I'm new in elasticsearch, can someone help whit this please?, thanks.

Answer 1

You need to also add the nested filter in the aggregation part to only aggregate the relevant nested documents, i.e. the ones related to TEMPERATURE, like this:
{
"query": {
"nested": {
"path": "sensor",
"query": {
"nested": {
"path": "sensor.values",
"query": {
"bool": {
"must": [
{
"match": {
"sensor.values.type": "TEMPERATURE"
}
}
]
}
}
}
}
}
},
"aggs": {
"agg_by_type": {
"nested": {
"path": "sensor.values"
},
"aggs": {
"temperature_only": {
"filter": {
"match": {
"sensor.values.type": "TEMPERATURE"
}
},
"aggs": {
"max_value": {
"max": {
"field": "sensor.values.value"
}
}
}
}
}
}
}
}

Answer 2

After a few days of work in another projects, i back to try make this query and finally i can do it, now i can get the data per day, hours, and by type of sensor, thanks for your help.
This is my code if somebody are trying the same.
{
"query": {
"bool": {
"filter": [
{
"bool": {
"must": [
{
"match": {
"mac": "34:ab:95:8f:84:c0"
}
}
],
"filter": [
{
"range": {
"timestamp": {
"gte": "2021-08-10",
"lt": "2021-08-25"
}
}
}
]
}
},
{
"nested": {
"path": "sensor",
"query": {
"bool": {
"must": [
{
"match": {
"sensor.type": 1
}
}
],
"should": [
{
"nested": {
"path": "sensor.values",
"query": {
"bool": {
"must": [
{
"match": {
"sensor.values.type": "HUMIDITY"
}
},
{
"match": {
"sensor.values.type": "TEMPERATURE"
}
}
]
}
}
}
}
]
}
}
}
}
]
}
},
"aggs": {
"values_per_day": {
"date_histogram": {
"field": "timestamp",
"fixed_interval": "1d",
"format" : "yyyy-MM-dd HH:mm:ss"
},
"aggs": {
"agg_type": {
"nested": {
"path": "sensor"
},
"aggs": {
"type_only": {
"filter": {
"match": {
"sensor.type": 1
}
},
"aggs": {
"agg_by_type": {
"nested": {
"path": "sensor.values"
},
"aggs": {
"temperature_only": {
"filter": {
"match": {
"sensor.values.type": "TEMPERATURE"
}
},
"aggs": {
"max_value": {
"max": {
"field": "sensor.values.value"
}
},
"min_value": {
"min": {
"field": "sensor.values.value"
}
}
}
},
"humedity_only": {
"filter": {
"match": {
"sensor.values.type": "HUMIDITY"
}
},
"aggs": {
"max_value": {
"max": {
"field": "sensor.values.value"
}
},
"min_value": {
"min": {
"field": "sensor.values.value"
}
}
}
}
}
}
}
}
}
}
}
}
},
"from": 0,
"sort": [
{
"timestamp": {
"order": "desc"
}
}
]
}