Search text in the Storm UI should be remained unchanged

Each time press the 'Search' button in the Storm UI, the text in the search box is escaped.

For example, if I type 'Prepared bolt' and press the button, it becomes 'Prepared+bolt'. And if press the button again, now it becomes 'Prepared%2Bbolt'. So only the first search succeeds, and the second search fails.

For continuous successes of the search, the search text should be remained unchanged.