springboot集成 elasticsearch8统计数量

好的，关于 springboot 集成 elasticsearch8 统计数量的问题，你可以使用 Elasticsearch 的 Count API 来实现。具体代码如下：

import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.indices.IndexExistsRequest;
import org.elasticsearch.client.indices.IndexExistsResponse;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.query.QuerySearchRequest;
import org.elasticsearch.search.query.QuerySearchResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class ElasticsearchService {
    @Autowired
    RestHighLevelClient restHighLevelClient;

    public long countDocument(String indexName, String field, String value) throws IOException {
        IndexExistsResponse indexExistsResponse = restHighLevelClient.indices().exists(new IndexExistsRequest(indexName), RequestOptions.DEFAULT);
        if (!indexExistsResponse.isExists()) {
            return 0;
        }
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        sourceBuilder.query(QueryBuilders.matchQuery(field, value));
        QuerySearchRequest searchRequest = new QuerySearchRequest(indexName);
        searchRequest.source(sourceBuilder);
        QuerySearchResponse searchResponse = restHighLevelClient.searchQuery(searchRequest, RequestOptions.DEFAULT);
        return searchResponse.getHits().getTotalHits().value;
    }
}

这段代码中，我们使用 Elasticsearch 的 Count API 实现了对指定索引中满足条件的文档数量统计。具体实现细节可以参考注释部分。希望对你有帮助！