can't see any file named 'Logstash.service' in path '/etc/systemd/system' can some one check and see if installation creates 'Logstash.service' file for you.
Resolved >>>the issue was with JAVA...
JAVA_HOME was pointing to user/JDK-1.8.0 because java was configured manually through .TAR file.
& While installation logstash look for java in usr/bin/java.
reinstalled java through yum and then logstash solved the problem.
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