GET on /rest/api/2/reindex doesn't return the status of the reindexing

Summary

A GET request on /rest/api/2/reindex does not return the status of the reindexing process

Steps to Reproduce

1. Run Re-Indexing
2. Send a GET request /rest/api/2/reindex to retrieve information about the reindex

Expected Results

Information about reindex is returned

{
"progressUrl": "/secure/admin/jira/IndexProgress.jspa?taskId=10007",
"currentProgress": 11,
"currentSubTask": "Currently working on: Issue index",
"type": "BACKGROUND",
"submittedTime": "2015-05-15T10:40:02.657+0800",
"startTime": "2015-05-15T10:40:02.658+0800",
"success": false
}

Actual Results

The below exception is thrown in the response (Using POSTMAN REST client)

Notes

Quoted from the REST API documentation:

Returns information on the system reindexes. If a reindex is currently taking place then information about this reindex is returned. If there is no active index task, then returns information about the latest reindex task run, otherwise returns a 404 indicating that no reindex has taken place.

Workaround

Use /rest/api/2/reindex/progress when reindex is progressing. However, this is only available from JIRA 6.4 onwards