elasticsearch6.3 自动补齐suggest java代码

package com.sinosafe.essuggest.service.Impl;

import com.sinosafe.essuggest.provider.Impl.EsSingleCon;
import com.sinosafe.essuggest.service.EsSuggestService;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.search.suggest.Suggest;
import org.elasticsearch.search.suggest.SuggestBuilder;
import org.elasticsearch.search.suggest.completion.CompletionSuggestionBuilder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author : zengxiaoyi
 * @E-mail :
 * @Date : 2018/6/29
 */
@Service
public class EsSuggestServiceImpl implements EsSuggestService {
 
    @Autowired
    private EsSingleCon esSingleCon;
  
    /**
     * es get suggest
     * @param index  索引
     * @param type  type，用的是es6.3，可以不写type，因为index下只允许一个type了
     * @param field  字段
     * @param context 内容
     * @return
     */
    @Override
    public List getSuggest(String index, String type, String field, String context) {
        List<String> result = new ArrayList<>();
       TransportClient transportClient=EsSingleCon.transportClient;
        SearchRequestBuilder searchRequestBuilder = transportClient.prepareSearch(index);
        //completion suggest
        CompletionSuggestionBuilder completionSuggestionBuilder = new CompletionSuggestionBuilder(field);
        //前缀查询 每次返回最多10条数据
        completionSuggestionBuilder.prefix(context).size(10);
        //"mysuggest"自定义名字
        SuggestBuilder suggestBuilder = new SuggestBuilder().addSuggestion("mysuggest", completionSuggestionBuilder);
        SearchResponse searchResponse = searchRequestBuilder.suggest(suggestBuilder).execute().actionGet();
        //保存es返回结果
        List<? extends Suggest.Suggestion.Entry<? extends Suggest.Suggestion.Entry.Option>> list = searchResponse
                .getSuggest().getSuggestion("mysuggest").getEntries();
        if (list == null) {
            return null;
        }
        else {
            //转为list保存结果字符串
            for (Suggest.Suggestion.Entry<? extends Suggest.Suggestion.Entry.Option> e : list) {
                for (Suggest.Suggestion.Entry.Option option : e) {
                    result.add(option.getText().toString());
                    System.out.println(option.getText().toString());
                }
            }
        }
        System.out.println(result);
        return result;

    }
}