code: public String deleteByPath(String path) throws ElasticSearchException{
  		try{
  			return this.client.executeHttp(path,ClientUtil.HTTP_DELETE);
  		}
  		catch(ElasticSearchException e){
  			return ResultUtil.hand404HttpRuntimeException(e,String.class,ResultUtil.OPERTYPE_deleteDocument);
  		}
  	}
docs: 删除索引文档
  @param path /twitter/_doc/1
  /twitter/_doc/1?routing=kimchy
  /twitter/_doc/1?timeout=5m
  @return