Rename an index in Laravel 5

I want to rename an index in Laravel 5.

In a previous migration a column was created for table named a like so:

$table->unsignedInteger('foo')->index('blah');

I want to rename the index so that it uses the default Laravel notation.

i.e. I want to rename the blah index to a_blah.

I know how to rename a normal column, like so:

$table->renameColumn('from', 'to');

But the documentation does not mention how to rename indexes.

How can I do this?

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