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());
}
}
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