Importing a backup while specifying a new index directory still deletes the old one

Steps to reproduce:

• import a backup to a currently running instance and specify a new index directory
• JIRA will create the new directory, populate the index, and then delete the old index comments and issues directories. The plugins directory remains.

In the logs is evidence that JIRA is attempting to delete

2008-11-11 17:16:17,317 http-8080-Processor22 ERROR [atlassian.jira.util.FileFactory] Unable to delete directory /tmp/jira/plugins

This is especially concerning for environments where production and development staging instances are hosted on the same box