用java实现fielddata=true

好的，以下是Java代码实现：

SearchRequest searchRequest = new SearchRequest("my_index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.size(0);
TermsAggregationBuilder aggregationBuilder = AggregationBuilders.terms("my_agg")
        .field("my_field")
        .fielddata(true);
searchSourceBuilder.aggregation(aggregationBuilder);
searchRequest.source(searchSourceBuilder);

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http")));

try {
    SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
    // 处理搜索结果
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        client.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

这段代码使用Elasticsearch Java客户端实现了一个搜索请求，其中包含一个`terms`聚合操作，并且启用了字段数据（`fielddata=true`）。可以根据具体的需求调整搜索条件和聚合操作。