code: public String getDocument(String indexName, String indexType,String documentId,Map<String,Object> options) throws ElasticSearchException{
  		try {
  			return this.client.executeHttp(BuildTool.buildGetDocumentRequest(indexName, indexType, documentId, options), ClientUtil.HTTP_GET);
  		}
  		catch(ElasticSearchException e){
  			return ResultUtil.hand404HttpRuntimeException(e,String.class,ResultUtil.OPERTYPE_getDocument);
  		}
  	}
docs: 获取文档，通过options设置获取文档的参数
  @param indexName
  @param indexType
  @param documentId
  @param options
  @return
  @throws ElasticSearchException