Unable to configure half-duplex on EX9214.

EX9214 is not having possible completions for half-duplex, it is limited to full-duplex.

{master}[edit]
root@jtac-ex9214-r2031-re0# set interfaces ge-3/0/0 link-mode ?
Possible completions:
  automatic            Automatically negotiate duplex
  full-duplex          Full-duplex operation

EX9214 Ethernet Switches provide high performance, scalable connectivity and carrier-class reliability for high-density environments such as campus aggregation and data-center networks. The EX9214 switch has a throughput of up to 13.2 terabits per second (Tbps) or up to 240 gigabits per second (Gbps) per slot full duplex. For more details, click here, EX9214_overview.