In this case you can take the logstash RPM file to the destination server and install it manually with rpm -i command.
File you're interested in is located in install/logstash/ directory.
Other than java 11 no additional dependencies are required.
What you might be interested in is to evaluate how you want to use parser on isolated server - what plugins you want to use? If there's a specific usecase, then you might download those plugins as files and later install them on logstash locally from files.
Also remember to activate only those pipeline that will work and you need in isolated network. Any updates to MISP will not work, so check /etc/logstash/pipelines.yml file.
