带有Java API的ElasticSearch完成建议器

Question

我已经在网上尝试了一些有关ElasticSearch的提示功能的示例代码，但是无法针对自动完成解决方案解决我的问题

我的索引：

client.prepareIndex("kodcucom", "article", "1")
      .setSource(putJsonDocument("ElasticSearch: Java",
        "ElasticSeach provides Java API, thus it executes all operations " +
        "asynchronously by using client object..",
         new Date(),
         new String[]{"elasticsearch"},
         "Hüseyin Akdoğan")).execute().actionGet();

我使用了suggestbuilder来获取关键字，然后扫描内容“字段”，这是由于没有结果而导致空指针异常的地方

CompletionSuggestionBuilder skillNameSuggest = new CompletionSuggestionBuilder("skillNameSuggest");

skillNameSuggest.text("lien");
skillNameSuggest.field("content");

SuggestRequestBuilder suggestRequestBuilder = client.prepareSuggest("kodcucom").addSuggestion(skillNameSuggest);

SuggestResponse suggestResponse = suggestRequestBuilder.execute().actionGet();

Iterator<? extends Suggest.Suggestion.Entry.Option> iterator =
          suggestResponse.getSuggest().getSuggestion("skillNameSuggest").iterator().next().getOptions().iterator();

我是否缺少一些过滤器或输入条件以获取结果？任何结果都应该可以，例如自动完成或找到记录。

编辑1：

这是我得到NPE的地方，我可以看到suggestResponse 调试模式下没有任何结果返回

Iterator<? extends Suggest.Suggestion.Entry.Option> iterator =
              suggestResponse.getSuggest().getSuggestion("skillNameSuggest").iterator().next().getOptions().iterator();

编辑2： 我正在使用2.1.1版本的ElasticSearch Java API

编辑3： 我试图将迭代器行拆分为几个代码块，将一组数据转换为迭代器时，NPE出现在最后一行，但是没有太多帮助

Suggest tempSuggest = suggestResponse.getSuggest();

Suggestion tempSuggestion = tempSuggest.getSuggestion("skillNameSuggest");

Iterator tempIterator = tempSuggestion.iterator();

我看到的代码：

SuggestRequestBuilder suggestRequestBuilder = client.prepareSuggest("kodcucom").addSuggestion(skillNameSuggest);

    SuggestResponse suggestResponse = suggestRequestBuilder.execute().actionGet();

已经包含一个空数组/数据集，我使用建议请求构建器的方式不正确吗？

Answer 1

为了使用完成功能，您需要专用一个字段，该字段将被称为完成，并且必须为其指定特殊的映射。

例如：

"mappings": {
   "article": {
     "properties": {
      "content": {
        "type": "string"
      },
     "completion_suggest": {
      "type": "completion"}
     }
   }
}

complete_suggest字段是上面代码示例中将用于自动完成功能的字段。在此映射定义之后，必须按如下所示索引数据：

curl -XPOST localhost:9200/kodcucom/article/1 -d '{
   "content": "elasticsearch",
   "completion_suggest": {
     "input": [ "es", "elastic", "elasticsearch" ],
     "output": "ElasticSearch"
   }
}'

然后可以如下使用Java API以获得建议：

CompletionSuggestionBuilder skillNameSuggest  = new CompletionSuggestionBuilder("complete");
skillNameSuggest.text("es");
skillNameSuggest.field("completion_suggest");

SearchResponse searchResponse = client.prepareSearch("kodcucom")
        .setTypes("article")
        .setQuery(QueryBuilders.matchAllQuery())
        .addSuggestion(skillNameSuggest)
        .execute().actionGet();

CompletionSuggestion compSuggestion = searchResponse.getSuggest().getSuggestion("complete");

List<CompletionSuggestion.Entry> entryList = compSuggestion.getEntries();
if(entryList != null) {
    CompletionSuggestion.Entry entry = entryList.get(0);
    List<CompletionSuggestion.Entry.Option> options =entry.getOptions();
    if(options != null)  {
        CompletionSuggestion.Entry.Option option = options.get(0);
        System.out.println(option.getText().string());
    }
}