code: public String updateIndiceMapping(String action,String indexMapping)  throws ElasticSearchException {
  	 	try {
  			return this.client.executeHttp(action, indexMapping, ClientUtil.HTTP_POST);
  		}
  		catch(ElasticSearchException e){
  			return ResultUtil.hand404HttpRuntimeException(e,String.class,ResultUtil.OPERTYPE_updateIndiceMapping);
  		}
  	 }
docs: 更新索引定义：my_index/_mapping
  https://www.elastic.co/guide/en/elasticsearch/reference/7.0/indices-put-mapping.html
  @param indexMapping
  @return
  @throws ElasticSearchException