WARNING: Could not find logstash.yml which is typically located in $LS_HOME/config or /etc/logstash

the problem there is that when you used the coomand you left this: [ / ] and you have to delete the [ . ] of the path settings in your command.

sudo bin/logstash --path.settings. /etc/logstash --path.data sensor39 -f /home/sayed/logstash/sayed.conf

it's not like that.

it's like this:

sudo bin/logstash --path.settings /etc/logstash/ --path.data sensor39 -f /home/sayed/logstash/sayed.conf

And please post the /etc/logstash/log4j2 configuration