场景：需要查询ES中userId为""或者userId字段不存在的数据

dsl语句：

{"from": 0,"size": 30,"query": {"bool": {"should": [{"term": {"userId": {"value": "","boost": 1.0}}},{"bool": {"must_not": [{"exists": {"field": "userId","boost": 1.0}}],"adjust_pure_negative": true,"boost": 1.0}}],"adjust_pure_negative": true,"minimum_should_match": "1","boost": 1.0}},"sort": [{"eventTime": {"order": "desc"}}]
}

java代码：

BoolQueryBuilder queryBuilder = new BoolQueryBuilder();
queryBuilder.should(new TermQueryBuilder("userId", ""));
queryBuilder.should(new BoolQueryBuilder().mustNot(new ExistsQueryBuilder("userId")));
//should中的条件满足任一条
queryBuilder.minimumShouldMatch(1);