Issue Summary

The user picker fields, except assignee, do not list the exact matches on top, and thus, the desired user is never displayed in the search results.

Steps to Reproduce

1. Create multiple users with different first names and the same last name or similar combinations where part of names are repeating. For clarity, refer to the screenshot below.
2. 
3. Now, navigate to Issues > Search for Issues. Open any issue and go to the dropdown "watcher".
4. Put the text there "l.gonzalez" (lets take this user as example corresponding to above screenshots) and one will get search results as below. We can see that the actual user didn't come as part of the search results which it should have. Same behavior is seen for the reporter field.
5. 

Expected Results

The exact matches should be displayed on the top,.

Actual Results

The exact matches never displayed. Also, there is a limit of showing just 20 matches.

Workaround

• Create a file named jira-config.properties in the "JIRA_HOME" directory if the file "jira-config.properties" doesn't exist already 
  • The default Jira HOME directory location is below if Jira was installed using the automated Windows or Linux installers.

  • C:\Program Files\Atlassian\Application Data\JIRA (Windows)
    /var/atlassian/application-data/JIRA (Linux) 

• Insert the following entry and save the file: (this will increase the suggestion list, 100 here just an example, could be anything >20)

• jira.ajax.autocomplete.limit = 100

• Restart Jira to ensure the configuration changes take effect.