Additional metrics | add percentiles to histogram aggregations (for numeric data).

[WassimDhib]

Is your feature request related to a problem? Please describe.

When defining a rollup job, you can aggregate additional fields from the source index into the target index. Rollup supports the terms aggregation (for all field types) and histogram aggregation (for numeric fields) : min/max/sum/avg/value count

When doing application performance analysis, we always check higher percentiles of performance KPIs (server time, round trip time ...)

Describe the solution you'd like
Can you add percentiles to histogram aggregations (for numeric data).