code: def get_field_mapping(self, fields, index=None, doc_type=None, params=None):
          
          if fields in SKIP_IN_PATH:
              raise ValueError("Empty value passed for a required argument 'fields'.")
          return self.transport.perform_request(
              "GET",
              _make_path(index, "_mapping", doc_type, "field", fields),
              params=params,
          )
docs: Retrieve mapping definition of a specific field.
          `<http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-get-field-mapping.html>`_
  
          :arg fields: A comma-separated list of fields
          :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 include_defaults: Whether the default mapping values should be
              returned as well
          :arg local: Return local information, do not retrieve the state from
              master node (default: false)
          :arg include_type_name: Specify whether requests and responses should include a
              type name (default: depends on Elasticsearch version).