Elasticsearch 6.3.1 failure and netstat listening even after failure

systemd[1]: elasticsearch.service: control process exited, code=exited status=1
.com systemd[1]: Failed to start LSB: elasticsearch.
.com systemd[1]: Unit elasticsearch.service entered failed state.
.com systemd[1]: elasticsearch.service failed.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[27164]: Starting elasticsearch:
.com runuser[27169]: pam_unix(runuser:session): session opened for user ogsoft by (uid=
.com runuser[27169]: pam_unix(runuser:session): session closed for user ogsoft
.com elasticsearch[27164]: [ OK ]
.com systemd[1]: elasticsearch.service: control process exited, code=exited status=1
.com systemd[1]: Failed to start LSB: elasticsearch.
.com systemd[1]: Unit elasticsearch.service entered failed state.
.com systemd[1]: elasticsearch.service failed.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[28852]: Starting elasticsearch:
.com runuser[28857]: pam_unix(runuser:session): session opened for user ogsoft by (uid=
.com runuser[28857]: pam_unix(runuser:session): session closed for user ogsoft
.com elasticsearch[28852]: [ OK ]
.com systemd[1]: elasticsearch.service: control process exited, code=exited status=1
.com systemd[1]: Failed to start LSB: elasticsearch.
.com systemd[1]: Unit elasticsearch.service entered failed state.
.com systemd[1]: elasticsearch.service failed.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[29340]: Starting elasticsearch:
.com runuser[29345]: pam_unix(runuser:session): session opened for user ogsoft by (uid=
.com runuser[29345]: pam_unix(runuser:session): session closed for user ogsoft
.com elasticsearch[29340]: [ OK ]
.com systemd[1]: Started LSB: elasticsearch.
.com systemd[1]: Stopping LSB: elasticsearch...
.com elasticsearch[31085]: Stopping elasticsearch:
.com elasticsearch[31085]: [ OK ]
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[31123]: Starting elasticsearch:
.com runuser[31128]: pam_unix(runuser:session): session opened for user ogsoft by (uid=
.com elasticsearch[31123]: [ OK ]
systemd[1]: Started LSB: elasticsearch.
.com systemd[1]: Stopping LSB: elasticsearch...
.com elasticsearch[98281]: Stopping elasticsearch:
.com elasticsearch[98281]: [ OK ]
.com systemd[1]: Stopped LSB: elasticsearch.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[98527]: Starting elasticsearch:
.com runuser[98532]: pam_unix(runuser:session): session opened for user ogsoft by (uid=
.com runuser[98532]: pam_unix(runuser:session): session closed for user ogsoft
.com elasticsearch[98527]: [ OK ]
.com systemd[1]: elasticsearch.service: control process exited, code=exited status=1
.com systemd[1]: Failed to start LSB: elasticsearch.
.com systemd[1]: Unit elasticsearch.service entered failed state.
.com systemd[1]: elasticsearch.service failed.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[100108]: Starting elasticsearch:
.com runuser[100113]: pam_unix(runuser:session): session opened for user ogsoft by (uid
.com elasticsearch[100108]: [ OK ]
.com systemd[1]: elasticsearch.service: control process exited, code=exited status=1
.com systemd[1]: Failed to start LSB: elasticsearch.
.com systemd[1]: Unit elasticsearch.service entered failed state.
.com systemd[1]: elasticsearch.service failed.
.com systemd[1]: Starting LSB: elasticsearch...
.com elasticsearch[100227]: Starting elasticsearch:
.com systemd[1]: Started LSB: elasticsearch.

these are the errors am getting for my elasticsearch 6.3.1 single node cluster.
netstat is stil listening after the service failure.
am not able to stop or restart or start the service after the failure until i kill the service using "kill -SIGTERM "
and start the elasticsearch service again.
again after few hours it will crash and same situation arises and i follow the same process using kill command and starting the service again.
it works but am not able to locate the root cause of this issue.
i have already used jvm options and heap size settings, heap size is not an issue.
can anyone help regarding this issue.ASAP.
thanxz!

● elasticsearch.service - LSB: elasticsearch
Loaded: loaded (/etc/rc.d/init.d/elasticsearch; bad; vendor preset: disabled)
Active: failed (Result: exit-code) since Fri 2018-08-03 19:22:33 UTC; 1min 17s ago
Docs: man:systemd-sysv-generator(8)
Process: 119204 ExecStop=/etc/rc.d/init.d/elasticsearch stop (code=exited, status=0/SUCCESS)
Process: 119244 ExecStart=/etc/rc.d/init.d/elasticsearch start (code=exited, status=1/FAILURE)
Tasks: 21
CGroup: /system.slice/elasticsearch.service
├─119259 /usr/java/latest/bin/java -Xms16g -Xmx16g -XX:+UseConcMarkSweepG...
└─119394 /opt/ogng/elasticsearch/modules/x-pack/x-pack-ml/platform/linux-...

Aug 03 19:22:28 rsa-dev-lm-data-02v.be.vzbi.com systemd[1]: Starting LSB: elasticsea...
Aug 03 19:22:28 rsa-dev-lm-data-02v.be.vzbi.com elasticsearch[119244]: Starting elas...
Aug 03 19:22:28 rsa-dev-lm-data-02v.be.vzbi.com runuser[119249]: pam_unix(runuser:se...
Aug 03 19:22:28 rsa-dev-lm-data-02v.be.vzbi.com runuser[119249]: pam_unix(runuser:se...
Aug 03 19:22:28 rsa-dev-lm-data-02v.be.vzbi.com elasticsearch[119244]: [ OK ]
Aug 03 19:22:33 rsa-dev-lm-data-02v.be.vzbi.com systemd[1]: elasticsearch.service: c...
Aug 03 19:22:33 rsa-dev-lm-data-02v.be.vzbi.com systemd[1]: Failed to start LSB: ela...
Aug 03 19:22:33 rsa-dev-lm-data-02v.be.vzbi.com systemd[1]: Unit elasticsearch.servi...
Aug 03 19:22:33 rsa-dev-lm-data-02v.be.vzbi.com systemd[1]: elasticsearch.service fa..

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