Elasticsearch service failure code=exited, status=78/n/a

I have installed ElasticSearch 7.3 on Ubuntu 18.04

I have done all necessary configurations. When I run it, I got the following messages in system.

*Error after running journalctl---

Sep 24 18:32:08 imacbook systemd[1]: Stopping Elasticsearch...

Sep 24 18:32:09 imacbook systemd[1]: Stopped Elasticsearch.

Sep 24 18:32:17 macbook systemd[1]: Started Elasticsearch.

Sep 24 18:32:18 macbook elasticsearch[3444]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 a

Sep 24 18:32:29 macbook systemd[1]: elasticsearch.service: Main process exited, code=exited, status=78/n/a

Sep 24 18:32:29 macbook systemd[1]: elasticsearch.service: Failed with result 'exit-code'.

*Error- after running status command

Sep 25 11:43:57 macbook systemd[1]: Started Elasticsearch.

Sep 25 11:43:58 macbook elasticsearch[8489]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 a

Sep 25 11:44:08 macbook systemd[1]: elasticsearch.service: Main process exited, code=exited, status=78/n/a

Sep 25 11:44:08 macbook systemd[1]: elasticsearch.service: Failed with result 'exit-code'.

How can I solve the problem? Thanks.

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