My ELK setup on unix box was working fine, but elasticsearch and kibana stopped working.
I restarted both services using
/etc/init.d/elasticsearch restart and
Kibana started working but elasticsearch did not.
# /etc/init.d/elasticsearch restart Stopping elasticsearch: [ OK ] /etc/init.d/elasticsearch: line 105: result: command not found Tue Jan 28 14:32:59 EST 2020 [INFO] Setting elasticsearch heap to -Xms64531m -Xmx64531m as Preformatted textdefault. Override this in /etc/elasticsearch/elasticsearch.conf if needed. Starting elasticsearch: nohup: appending output to `nohup.out'