Check if a type/types exists in an index/indices.
        `<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-types-exists.html>`_

        :arg index: A comma-separated list of index names; use `_all` to check
            the types across all indices
        :arg doc_type: A comma-separated list of document types to check
        :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 'open', 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 exists_type(self, index, doc_type, params=None):
        """
        Check if a type/types exists in an index/indices.
        `<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-types-exists.html>`_

        :arg index: A comma-separated list of index names; use `_all` to check
            the types across all indices
        :arg doc_type: A comma-separated list of document types to check
        :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 'open', 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)
        """
        for param in (index, doc_type):
            if param in SKIP_IN_PATH:
                raise ValueError("Empty value passed for a required argument.")
        return self.transport.perform_request(
            "HEAD", _make_path(index, "_mapping", doc_type), params=params
        )