Trends metric on Kibana Dashboard, it’s possible? - elasticsearch

Question

I want to create a metric in kibana dashboard, which use ratio of multiple metrics and offset period.
Example :
Date Budget
YYYY-MM-DD $
2019-01-01 15
2019-01-02 10
2019-01-03 5
2019-01-04 10
2019-01-05 12
2019-01-06 4
If I select time range between 2019-01-04 to 2019-01-06 , I want to compute ratio with offset period: 2019-01-01 to 2019-01-03.
to resume : (sum(10+12+4) - sum(15+10+5)) / sum(10+12+4) = -0.15
evolution of my budget equal to -15% (and this is what I want to print in the dashboard)
But, with metric it's not possible (no offset), with visual builder: different metric aggregation do not have different offset (too bad because bucket script allow to compute ratio), and with vega : I not found a solution too.
Any idea ? Thanks a lot
Aurélien
NB: I use kibana version > 6.X

Answer 1

Please check the below sample mapping which I've constructed based on data you've provided in the query and aggregation solution that you wanted to take a look.
Mapping:
PUT <your_index_name>
{
"mappings": {
"mydocs": {
"properties": {
"date": {
"type": "date",
"format": "yyyy-MM-dd"
},
"budget": {
"type": "float"
}
}
}
}
}
Aggregation
I've made use of the following types of aggregation:
Date Histogram where I've mentioned interval as 4d based on the data you've mentioned in the question
Sum
Derivative
Bucket Script which actually gives you the required budget evolution figure.
Also I'm assuming that the date format would be in yyyy-MM-dd and budget would be of float data type.
Below is how your aggregation query would be.
POST <your_index_name>/_search
{
"size": 0,
"query": {
"range": {
"date": {
"gte": "2019-01-01",
"lte": "2019-01-06"
}
}
},
"aggs": {
"my_date": {
"date_histogram": {
"field": "date",
"interval": "4d",
"format": "yyyy-MM-dd"
},
"aggs": {
"sum_budget": {
"sum": {
"field": "budget"
}
},
"budget_derivative": {
"derivative": {
"buckets_path": "sum_budget"
}
},
"budget_evolution": {
"bucket_script": {
"buckets_path": {
"input_1": "sum_budget",
"input_2": "budget_derivative"
},
"script": "(params.input_2/params.input_1)*(100)"
}
}
}
}
}
}
Note that the result that you are looking for would be in the budget_evolution part.
Hope this helps!