Init: logstash main process ended, respawning


I am trying to setup ELK first time ever and has success in setting up Elasticsearch and Kibana but facing issue with Logstash.

My env. -
OS - Ubuntu 14.04 on Virtualbox
Logstash - 5.0.2 installed using .deb offline

Issue -
I am able to start logstash service using 'sysctl start logstash' but process gets terminated very frequently. see the below log. It also says that i should pass a parameter as -f with a config file. Which one ? The default config is in /etc/logstash/logstash.yml and config is at /etc/logstash/conf.d/beats.conf.
Configtest is OK on above config attached screen shot at end.
This is very frusterating for me because it's first time I am trying but not able to setup since past week.
What am I doing wrong ?

/var/log/syslog -
Mar 21 12:16:07 logstash kernel: [ 2053.632085] init: logstash main process (1948) terminated with status 1
Mar 21 12:16:07 logstash kernel: [ 2053.632085] init: logstash main process ended, respawning

Sending Logstash's logs to /usr/share/logstash/logs which is now configured via
ERROR: No configuration file was specified. Perhaps you forgot to provide the '-f yourlogstash.conf' flag?
bin/logstash -f CONFIG_PATH [-t] [-r] [-w COUNT] [-l LOG]
bin/logstash -e CONFIG_STR [-t] [--log.level fatal|error|warn|info|debug|trace] [-w COUNT] [-l LOG]
bin/logstash -i SHELL [--log.level fatal|error|warn|info|debug|trace]
bin/logstash -V [--log.level fatal|error|warn|info|debug|trace]
bin/logstash --help

/usr/share/logstash/logs/logstash-plain.log -
No log

/var/log/logstash -
No log file created

Config test output -

If i run this - "/usr/share/logstash/bin# ./logstash -f /etc/logstash/conf.d/beats.conf --debug" it works. Logs below (sorry for long output)

root@logstash:/usr/share/logstash/bin# ./logstash -f /etc/logstash/conf.d/beats.conf --debug
WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash. You can specify the path using --path.settings. Continuing using the defaults
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
Could not find log4j2 configuration at path /usr/share/logstash/config/ Using default config which logs to console
12:32:21.638 [LogStash::Runner] DEBUG logstash.runner - -------- Logstash Settings (* means modified) ---------
12:32:21.642 [LogStash::Runner] DEBUG logstash.runner - "logstash"
12:32:21.643 [LogStash::Runner] DEBUG logstash.runner - *path.config: "/etc/logstash/conf.d/beats.conf"
12:32:21.643 [LogStash::Runner] DEBUG logstash.runner - "/usr/share/lo
12:32:25.218 [[main]-pipeline-manager] INFO - Beats inputs: Starting input listener {:address=>""}
12:32:25.325 [[main]-pipeline-manager] INFO logstash.pipeline - Pipeline main started
12:32:25.359 [Api Webserver] DEBUG logstash.agent - Starting puma
12:32:25.365 [Api Webserver] DEBUG logstash.agent - Trying to start WebServer {:port=>9600}
12:32:25.371 [Api Webserver] DEBUG logstash.api.service - [api-service] start
12:32:25.511 [Api Webserver] INFO logstash.agent - Successfully started Logstash API endpoint {:port=>9600}

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