[Backport 2.x] Perform buildAggregation concurrently and partially support composite aggs #5260
| Job | Run time |
|---|---|
| 11m 0s | |
| 11m 52s | |
| 35m 23s | |
| 10m 11s | |
| 11m 22s | |
| 23m 1s | |
| 10m 7s | |
| 11m 29s | |
| 24m 49s | |
| 2h 29m 14s |
| Job | Run time |
|---|---|
| 11m 0s | |
| 11m 52s | |
| 35m 23s | |
| 10m 11s | |
| 11m 22s | |
| 23m 1s | |
| 10m 7s | |
| 11m 29s | |
| 24m 49s | |
| 2h 29m 14s |