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The Linked Issue Field displays the number of linked (with specified link type) issues. And it is searchable: e.g. you can find issues which have more than 3 linked issues with 'causes' issue link type.specified field/custom field within the linked issue. 

To create a Linked Issue Field 

• Navigate to to Jira Admin > Add-ons Manage Apps > Enhancer Plugin For Jira Menu > Custom Field Configuration and go to the Comment tabFields (JEP).
• Click on the Image Added button.
• Click on the Parent/Linked Issue Custom Fields button and select Linked Issue Field.

...

• /Epic Issue tab on the left-hand side of the dialogue. 
• Select Linked Issue Field, then click Add custom field.

Image Added

• Fill in the dialog box:
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  • Create a Name for the field.
  • Select the issue link typeIssue Link Type.
  • Select Field/Custom Field.
• Click on the Add the Save Custom Field button.
  
• You can define as many comment fields Linked Issue Field as you want.

This custom field can be used to sort or search in issue navigator.