Searching custom fields in the user app - in existing search box

Library staff want to be able to search custom fields.
Depending on the type of custom field, it may be searched as a string in the text entry box, or as a filter similar to tags for a single or multiselect

User story statement(s):

As a library staff member
I want to search in the user record
so that I can see the users that contain the specified text.
If the custom field is a radio button or select field see UIU 2170

Scenarios:

1. Scenario:
   • Given that a text field (either "text" or "text area")has been defined as a custom field
   • When the text is entered in the box labeled Keyword (name, email, identifier), a drop down will be seen labeled "Custom Fields"
   • When the Custom Fields index is chosen, and a text string entered i.e. a patron's campus-wide ID, G1076789
   • Then the record or records that match the text will be displayed.