To find Delta difference between bucket aggregations

Elastic Stack Elasticsearch
1

I have 2 buckets aggregration for different time interval. i get metrics from different data sources and i get the unique count of metrics i get from different data source. Example
my individual bucket aggregation looks like this
Bucket 1 (Timestamp: yesterday)

{data source1} {unique count 1}
{data source 2} {unique count 2}
{data source n} {unique count n}

Bucket 2 (Timestamp: today)

{data source1} {unique count 1}
{data source 2} {unique count 2}
{data source n} {unique count n}

I want to find the delta of unique counts between each data-source across the 2 buckets and plot the delta against the data source. How could i achieve it. ? appreciate any inputs

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