Issue Summary

Advanced JQL search is broken for Ampersand  (&) and other special character while linking an Issue 

This is reproducible on Data Center: Yes

Steps to Reproduce

1. Create a custom field having values with  Ampersand  (&)  or plus sign (+)
   Ex: 
   Testing Field = "Dealing & Execution" 
2. Add this custom field to the New/existing issue.
3. Now link this issue through Advanced Search
4. While searching for the issue to link it under issue —> more --> Link --> Search For An Issue --> Advanced search Provide below JQL Query 
   Testing Field = "Dealing & Execution"
5. It is throwing “Invalid JQL query.” Error    
   
6. The same Advance JQL query with Ampersand  (&) special character works fine in Normal Issue Search Screen.  
   

Expected Results

Advance JQL Query with  Ampersand  (&)  special character should list the issue while searching it under the issue link Page.

Actual Results

Advance JQL Query with  Ampersand  (&)  special character shows an “Invalid JQL query” Error while searching the issue under the issue link Page.

Workaround

1. If we use the Unicode value of ampersand, it works fine.
   • Ex: Testing Field = "Dealing \u0026 Execution"
     

Notes

It also affects searching for Project. In this situation, search using project key instead of the project name.