你知道多重搜索的要求吗？
假设我们有这样一个结构的类请求：

class Request {
    private String index;
    private String field;
    private String value;
}

索引-elasticsearch索引
我们正在寻找的领域
值-字段值
跨多个索引的搜索如下所示

public MultiSearchResponse find(List<Request> requests) throws IOException {

    MultiSearchRequest multiSearchRequest = new MultiSearchRequest();

    for (Request req : requests){
        QueryBuilder queryBuilder = QueryBuilders.boolQuery()
                .must(QueryBuilders.matchBoolPrefixQuery(req.field, req.value));

        SearchSourceBuilder builder = new SearchSourceBuilder();
        builder.size(1);
        builder.query(queryBuilder);

        SearchRequest searchRequest = new SearchRequest();
        searchRequest.searchType(SearchType.DFS_QUERY_THEN_FETCH);
        searchRequest.indices(req.index);
        searchRequest.source(builder);

        multiSearchRequest.add(searchRequest);
    }

    return restHighLevelClient.msearch(multiSearchRequest, RequestOptions.DEFAULT);
}

我不知道我的解决方案是否有用，但是
--升级版--
在我最喜欢的项目中，我就是这样

public static List<SensorValueElasticsearch> parse(MultiSearchResponse response) {

    List<SensorValueElasticsearch> values = new ArrayList<>();

    for (MultiSearchResponse.Item item : response.getResponses()){
        if (item.getResponse().getHits().getTotalHits().value > 0){
            values.addAll(convertToList(item.getResponse()));
        }
    }
    return values;
}

public static List<SensorValueElasticsearch> convertToList(SearchResponse response) {
    SearchHit[] res = response.getHits().getHits();

    List<SensorValueElasticsearch> list = new LinkedList<>();

    for (SearchHit sh : res) {

        SensorValueElasticsearch object = null;
        try {
            object = OBJECT_MAPPER.readValue(sh.getSourceAsString(), SensorValueElasticsearch.class);
        } catch (JsonProcessingException e) {
            LOGGER.warn("Error while convert SearchResponse to SensorValueElasticsearch", e);
        }

        list.add(object);
    }

    return list;
}

在你之前的情况下 OBJECT_MAPPER.readValue 必须检查找到的对象类型，或使用try-catch块写入return，如下所示：

ObjectA a = null;
        ObjectB b = null;

        try {
            return OBJECT_MAPPER.readValue(sh.getSourceAsString(), ObjectA.class);
        } catch (JsonProcessingException e) {
            // ignore
        }

        try {
            return OBJECT_MAPPER.readValue(sh.getSourceAsString(), ObjectB.class);
        } catch (JsonProcessingException e) {
            // ignore
        }

        throw new IllegalArgumentException("Unknown class");