'Delete an alias.
(See :ref:`es-guide-reference-api-admin-indices-aliases`)
The specified index or indices are deleted from the alias, if they are
in it to start with.  This won\'t report an error even if the indices
aren\'t present in the alias.
:param alias: the name of an alias
:param indices: a list of indices'

def delete_alias(self, alias, indices):

    indices = self.conn._validate_indices(indices)
    return self.change_aliases((['remove', index, alias, {}] for index in indices))
