ZUncommit is enabled by default?

[Sundara Mohan M]

Hi,
 I am using following java version and see Uncommit feature is disabled by
default
openjdk version "13.0.1" 2019-10-15
OpenJDK Runtime Environment AdoptOpenJDK (build 13.0.1+9)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 13.0.1+9, mixed mode, sharing)

GC logs

[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] Initializing The Z
Garbage Collector
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] Version: 13.0.1+9
(release)
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] NUMA Support: Enabled
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] NUMA Nodes: 2
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] CPUs: 48 total, 48
available
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] Memory: 128318M
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] Large Page Support:
Disabled
[2019-12-10T18:47:43.171+0000][0.007s][info][gc,init] Workers: 40 parallel,
7 concurrent
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Address Space:
0x0000040000000000 - 0x0000140000000000 (16T)
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Heap backed by file:
/tmp/java_heap.112273
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Min Capacity: 80000M
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Initial Capacity:
80000M
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Max Capacity: 80000M
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Max Reserve: 112M
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Pre-touch: Enabled
[2019-12-10T18:47:43.174+0000][0.010s][info][gc,init] Available space on
backing filesystem: 125929M
*[2019-12-10T18:48:30.290+0000][47.126s][info][gc,init] Uncommit: Disabled*
[2019-12-10T18:49:30.315+0000][107.151s][info][gc,init] Runtime Workers: 40
parallel
[2019-12-10T18:49:30.318+0000][107.155s][info][gc     ] Using The Z Garbage
Collector
...
Is this feature enabled by default in later release only?

Thanks
Sundar