As of today, my only comment is to recommend downloading the pre-compiled logstash jar file directly from http://logstash.net. Do not install a logstash rpm, there is no need.
Example: Objective is to deploy logstash in /opt
mkdir /opt/logstash mkdir /opt/logstash/filters mv logstash* /opt/logstash
If you place in /opt you may want to also add the location to your PATH.
Another option is to place the file in a place like /bin which is already in the PATH but beware it might become a bit messy, eg the default location for filter plugins will always be a subdirectory named "filters" relative to the location of the binary.