Delete index for object

[emiraga]

Just though it might help someone. I modified existing indexed_title_changed. Added new method to class Searchable

def delete_index(self):
    """Remove index entities for this model."""
    klass = StemmedIndex if self.INDEX_STEMMING else LiteralIndex
    query = klass.all(keys_only=True).ancestor(self.key())
    delete_keys = query.fetch(1000)
    db.delete(delete_keys)

When deleting record do this:
p.delete_index()
p.delete()