I'm submitting a ...

• bug report
• feature request
• other

Current behavior:

After filtering and array that is being repeated and has a custom directive in each repeated element that has an isolated scope. The custom directive is not reinitiated.

I assume this is expected behaviour but can be confusing and should be made clearer as to what putting track by $index can do to your custom directives.

Expected / new behavior:
NA

Minimal reproduction of the problem with instructions:

1. create ng repeat with a custom directive inside (include track by $index)
2. using $filter on the repeat array filter the array and you will notice the data in the directive will not reflect the new filtered array

AngularJS version: 1.5.10

Browser: all

Anything else:

Could the docs be made more clear between the what Angular is doing when using track by and that using $index with custom directives is not going to work.

Check my response here for a break down of the issue
https://stackoverflow.com/a/47310734/2536454