Bucket Script Aggregationedit
A parent pipeline aggregation which executes a script which can perform per bucket computations on specified metrics in the parent multi-bucket aggregation. The specified metric must be numeric and the script must return a numeric value.
Syntaxedit
A bucket_script aggregation looks like this in isolation:
{
"bucket_script": {
"buckets_path": {
"my_var1": "the_sum",
"my_var2": "the_value_count"
},
"script": "params.my_var1 / params.my_var2"
}
}
|
Here, |
Table 7. bucket_script Parameters
| Parameter Name | Description | Required | Default Value |
|---|---|---|---|
|
The script to run for this aggregation. The script can be inline, file or indexed. (see Scripting for more details) |
Required |
|
|
A map of script variables and their associated path to the buckets we wish to use for the variable
(see |
Required |
|
|
The policy to apply when gaps are found in the data (see Dealing with gaps in the data for more details) |
Optional |
|
|
format to apply to the output value of this aggregation |
Optional |
|
The following snippet calculates the ratio percentage of t-shirt sales compared to total sales each month:
POST /sales/_search
{
"size": 0,
"aggs" : {
"sales_per_month" : {
"date_histogram" : {
"field" : "date",
"calendar_interval" : "month"
},
"aggs": {
"total_sales": {
"sum": {
"field": "price"
}
},
"t-shirts": {
"filter": {
"term": {
"type": "t-shirt"
}
},
"aggs": {
"sales": {
"sum": {
"field": "price"
}
}
}
},
"t-shirt-percentage": {
"bucket_script": {
"buckets_path": {
"tShirtSales": "t-shirts>sales",
"totalSales": "total_sales"
},
"script": "params.tShirtSales / params.totalSales * 100"
}
}
}
}
}
}
And the following may be the response:
{
"took": 11,
"timed_out": false,
"_shards": ...,
"hits": ...,
"aggregations": {
"sales_per_month": {
"buckets": [
{
"key_as_string": "2015/01/01 00:00:00",
"key": 1420070400000,
"doc_count": 3,
"total_sales": {
"value": 550.0
},
"t-shirts": {
"doc_count": 1,
"sales": {
"value": 200.0
}
},
"t-shirt-percentage": {
"value": 36.36363636363637
}
},
{
"key_as_string": "2015/02/01 00:00:00",
"key": 1422748800000,
"doc_count": 2,
"total_sales": {
"value": 60.0
},
"t-shirts": {
"doc_count": 1,
"sales": {
"value": 10.0
}
},
"t-shirt-percentage": {
"value": 16.666666666666664
}
},
{
"key_as_string": "2015/03/01 00:00:00",
"key": 1425168000000,
"doc_count": 2,
"total_sales": {
"value": 375.0
},
"t-shirts": {
"doc_count": 1,
"sales": {
"value": 175.0
}
},
"t-shirt-percentage": {
"value": 46.666666666666664
}
}
]
}
}
}