public   String addDateDocument(String indexName,   Object bean) throws ElasticSearchException{
		return addDateDocument(  indexName, _doc,    bean);
	}
public String addDateDocument ( String indexName , Object bean ) throws ElasticSearchException { return addDateDocument ( indexName , _doc , bean ) ; }
创建索引文档，根据elasticsearch.xml中指定的日期时间格式，生成对应时间段的索引表名称
@param indexName
@param bean
@return
@throws ElasticSearchException