Logstash and cloud foundry

The cloud services Logging and kibana-me-logs can be used for developing cloud apps, but both services do not seem to be customizable, e.g. for logstash service I do not know how to access the configuration files or implement my own *.conf files.

Does anyone know how to deploy ELK, particularly logstash in the cloud (cloud foundry) either with existing cloud services like logging and logsearch, or from scratch? Again, I would like to use my own *.conf files to process log files generated locally.

(I apologize if this questions sounds too basic, in which case, direct me to resources you know that would help me get started?)