Is it possible to load LogStash configs like sudoers.d/ works?

Hello everyone, and I'm not sure if my question will make sense at first.

I installed LogStash using the RPM on a RHEL 6 box. It created a /etc/logstash/conf.d/ folder. I'm wondering if I can have a single LogStash config file that loads a bunch of filter files out of the conf.d/ folder? If not, then will I have to stick to a monolithic LogStash configuration file with a bunch of filters in it?

It does the same thing using it's default conf directory.

So I should be able to have a /etc/logstash/logstash.conf with a default input, and output, then inside of /etc/logstash/conf.d/index_specfic.conf with some specific filters?

I don't know if that will work, try it with the -f flag and multiple paths?