@gen.coroutine<EOL><INDENT>@query_params('<STR_LIT>', '<STR_LIT>', '<STR_LIT>',<EOL>'<STR_LIT>')<EOL>def get_mapping(self, index=None, doc_type=None, params=None):<DEDENT>
_, data = yield self.transport.perform_request('<STR_LIT:GET>',<EOL>_make_path(index,<EOL>'<STR_LIT>',<EOL>doc_type),<EOL>params=params)<EOL>raise gen.Return(data)<EOL>
Retrieve mapping definition of index or index/type.
`<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-get-mapping.html>`_
:arg index: A comma-separated list of index names
:arg doc_type: A comma-separated list of document types
: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)