code: public MapSearchHit getDocumentHit(String indexName,   String documentId, Map<String, Object> options) throws ElasticSearchException{
  		return getDocumentHit(  indexName,  _doc,   documentId,  options);
  	}
docs: 获取文档MapSearchHit对象，封装了索引文档的所有属性数据
  @param indexName
  @param documentId
  @param options
  @return
  @throws ElasticSearchException