Retrieve a specified alias.
        `<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html>`_

        :arg index: A comma-separated list of index names to filter aliases
        :arg name: A comma-separated list of alias names to return
        :arg allow_no_indices: Whether to ignore if a wildcard indices
            expression resolves into no concrete indices. (This includes `_all`
            string or when no indices have been specified)
        :arg expand_wildcards: Whether to expand wildcard expression to concrete
            indices that are open, closed or both., default 'all', valid choices
            are: 'open', 'closed', 'none', 'all'
        :arg ignore_unavailable: Whether specified concrete indices should be
            ignored when unavailable (missing or closed)
        :arg local: Return local information, do not retrieve the state from
            master node (default: false)

def get_alias(self, index=None, name=None, params=None):
        """
        Retrieve a specified alias.
        `<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html>`_

        :arg index: A comma-separated list of index names to filter aliases
        :arg name: A comma-separated list of alias names to return
        :arg allow_no_indices: Whether to ignore if a wildcard indices
            expression resolves into no concrete indices. (This includes `_all`
            string or when no indices have been specified)
        :arg expand_wildcards: Whether to expand wildcard expression to concrete
            indices that are open, closed or both., default 'all', valid choices
            are: 'open', 'closed', 'none', 'all'
        :arg ignore_unavailable: Whether specified concrete indices should be
            ignored when unavailable (missing or closed)
        :arg local: Return local information, do not retrieve the state from
            master node (default: false)
        """
        return self.transport.perform_request(
            "GET", _make_path(index, "_alias", name), params=params
        )