Search request type with multibyte keyword in customer portal doesn't return any results

Issue Summary

Search request type with multibyte keyword in customer portal doesn't return any results

Environment

• Jira Service Desk 4.1.0
• Not to be reproduced in Jira Service Desk 4.0.2, 4.2.1

Steps to Reproduce

1. Create new request type which is called "テスト"
2. Input a keyword "テスト" in customer portal search field

Expected Results

The request type should be suggested.

Actual Results

Doen't return any request type with keyword "テスト".

Notes

Multibyte text "テスト" encoded 2 times.

• <BASE_URL>/rest/servicedesk/search/1/search/request-type?query=%25E3%2583%2586%25E3%2582%25B9%25E3%2583%2588&resultLimit=5&serviceDeskId=1&_=1559096535526

  {
  	requestTypes: [ ]
  }
  

When decode the query, return proper results.

• <BASE_URL>/rest/servicedesk/search/1/search/request-type?query=%E3%83%86%E3%82%B9%E3%83%88&resultLimit=5&serviceDeskId=1&_=1559097269350

  {
  	requestTypes: [
  		{
  			id: 17,
  			cvId: 1,
  			icon: 10638,
  			issueType: 10001,
  			name: "テスト",
  			portalName: "IT Service Desk",
  			description: "Japanese",
  			searchScore: 0
  		}
  	]
  }
  

"Search for an article" has same issue.

• <BASE_URL>/rest/servicedesk/knowledgebase/latest/articles/search?project=ISD&query=%25E3%2583%2586%25E3%2582%25B9%25E3%2583%2588&_=1559116663620

  {
  	results: [ ],
  	total: 0,
  	pageNumber: 1,
  	resultsPerPage: 3
  }
  

• <BASE_URL>/rest/servicedesk/knowledgebase/latest/articles/search?project=ISD&query=%E3%83%86%E3%82%B9%E3%83%88&_=1559116663620

  {
  	results: [
  		{
  			id: "65622",
  			title: "@@@hl@@@テスト@@@endhl@@@３",
  			url: "/pages/viewpage.action?pageId=65622&src=search",
  			appLinkUrl: "http://confluence:8090",
  			shareable: true,
  			bodyTextHighlights: "て",
  			portalName: "IT Service Desk",
  			spaceKey: "ds",
  			appLinkId: "ab9528d2-ba64-36d2-ad73-62624a5c7f9f"
  		}
  	],
  	total: 1,
  	pageNumber: 1,
  	resultsPerPage: 3
  }
  

Workaround

Upgrade to latest version.