Add logstash_plugin example for lower heap size
Add logstash_plugin example for lower heap size

In a scenario where you've set your logstash heap size high, you may need to set your heap lower in order to execute logstash-plugin while logstash is still running.

Here's an example of someone running into insufficient memory while executing logstash-plugin: https://discuss.elastic.co/t/logstash-plugin-and-jvm-options/99646

This scenario is probably fairly common, so it may be worth documenting as an example.

+label: docsite_pr
thaim/ansible,thaim/ansible