Support for index aliases

[zpchavez]

Mirage should have the option to select an index by its alias. When following the zero down-time reindex pattern, the index name will change with every reindexing, but the alias will remain the same. Currently this means all saved queries in Mirage will become invalid.

[siddharthlatest]

@zpchavez Yes, aliases should be supported instead of app name.

And also confirming the issue - currently, mirage returns a 401 error code.

[siddharthlatest]

Fixed here cd500ee.