[Backport 2.x] [Tiered Cache] Use ConcurrentHashMap explicitly in IndicesRequestCache #29857
| Job | Run time |
|---|---|
| 12m 10s | |
| 21m 20s | |
| 18m 36s | |
| 12m 2s | |
| 18m 29s | |
| 19m 38s | |
| 11m 52s | |
| 18m 21s | |
| 18m 41s | |
| 2h 31m 9s |
| Job | Run time |
|---|---|
| 12m 10s | |
| 21m 20s | |
| 18m 36s | |
| 12m 2s | |
| 18m 29s | |
| 19m 38s | |
| 11m 52s | |
| 18m 21s | |
| 18m 41s | |
| 2h 31m 9s |