db_index=True not working, and indexes in class Meta yes

I have a model like this (simplified code):

class Agreement(modes.Model):
    job = models.ForeignKey(...)
    class Meta:
         indexes = (                        
             models.Index(fields=['job']),
        )

And when run migrations, the index is created.

BUT, after doing this:

class Agreement(modes.Model):
    job = models.ForeignKey(..., db_index=True)

And running makemigrations, I have this on my console output:

- Remove index agreements__job_id_eb7df0_idx from agreement

Why db_index, is not working like it is supposed to work? 

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