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HA setting for per-job YARN session

i am using  the " per-job YARN session " mode deploy flink job on yarn.
The document https://ci.apache.org/projects/flink/flink-docs-release-1.5/ops/jobmanager_high_availability.html#yarn-cluster-high-availability
 says that "we don’t run multiple JobManager (ApplicationMaster)
instances" but still give an example about how to config an Highly
Available YARN Session cluster.

My question is:  does the " per-job YARN session "  mode should  also
use HA setting ? Because in my test case without using zookeeper HA ,
if the YarnApplicationMasterRunner/Jobmanager is failed or killed
,yarn can only restart the YarnApplicationMasterRunner/Jobmanager
program but no job graph is submitted to the Jobmanager again.