Problem Definition

To export search result to CSV, Word, and XML, there's no way to exclude fields with considering visibility such as internal comments.
This is especially needed for JIRA Server users because they don't' have an option to query database.

Suggested Solution

Provide a feature to select visibility for example "Export CSV as Customer".

Workaround

Fetch issue data by using JIRA Server REST API with considering "visibility" column.
For example to exclude internal comments, "visibility" property is available in Jira Server platform REST API > api/2/issue > Get comments.

"visibility": {
                "type": "role",
                "value": "Administrators"
            }