docs: def reload_import_config(handler, host=None, core_name=None, verbose=False):
      '''
      MASTER ONLY
      re-loads the handler config XML file.
      This command can only be run if the minion is a 'master' type
  
      handler : str
          The name of the data import handler.
      host : str (None)
          The solr host to query. __opts__['host'] is default.
      core : str (None)
          The core the handler belongs to.
      verbose : boolean (False)
          Run the command with verbose output.
  
      Return : dict<str,obj>::
  
          {'success':boolean, 'data':dict, 'errors':list, 'warnings':list}
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' solr.reload_import_config dataimport None music {'clean':True}
      '''
  
      # make sure that it's a master minion
      if not _is_master() and _get_none_or_value(host) is None:
          err = [
              'solr.pre_indexing_check can only be called by "master" minions']
          return _get_return_dict(False, err)
  
      if _get_none_or_value(core_name) is None and _check_for_cores():
          err = ['No core specified when minion is configured as "multi-core".']
          return _get_return_dict(False, err)
  
      params = ['command=reload-config']
      if verbose:
          params.append("verbose=true")
      url = _format_url(handler, host=host, core_name=core_name, extra=params)
      return _http_request(url)