Proper documentation for JIRA to JIRA Issue Copy plugins (Remote copy plugin)

JIRA to JIRA Issue Copy is stated as supported by Atlassian. However, there is no documentation about installation/configuration/usage in any place - including the plugin's page in MAC.

It'd be great if we can have a proper guideline for customer to install and using this plugin and for support to have a quick reference to handle customer's question. Such as which custom fields are supported or not.