Querying with Completion Suggesters in Elasticsearch with Java API - elasticsearch

Question

I have my indices created, and mapping type for my 'suggest' field set to completion. I can't figure out how to configure the query for completion suggestions in elastic-search (Java API)
I'm trying to use this Query to base my implementation off of.
"song-suggest" : {
"text" : "n",
"completion" : {
"field" : "suggest"
}
}
Here's what I have so far,
CompletionSuggestionBuilder compBuilder = new CompletionSuggestionBuilder("complete");
compBuilder.text("n");
compBuilder.field("suggest");
SearchResponse searchResponse = localClient.prepareSearch(INDEX_NAME)
.setTypes("completion")
.setQuery(QueryBuilders.matchAllQuery())
.addSuggestion(compBuilder)
.execute().actionGet();
CompletionSuggestion compSuggestion = searchResponse.getSuggest().getSuggestion("complete");
Am I missing something, doing something wrong? Thanks!

Answer 1

Not sure if this is the best thing to do. But this works for me. Hope it helps.
#Override
public List<SuggestionResponse> findSuggestionsFor(String suggestRequest) {
CompletionSuggestionBuilder suggestionsBuilder = new CompletionSuggestionBuilder("completeMe");
suggestionsBuilder.text(suggestRequest);
suggestionsBuilder.field("suggest");
SuggestRequestBuilder suggestRequestBuilder =
client.prepareSuggest(MUSIC_INDEX).addSuggestion(suggestionsBuilder);
logger.debug(suggestRequestBuilder.toString());
SuggestResponse suggestResponse = suggestRequestBuilder.execute().actionGet();
Iterator<? extends Suggest.Suggestion.Entry.Option> iterator =
suggestResponse.getSuggest().getSuggestion("completeMe").iterator().next().getOptions().iterator();
List<SuggestionResponse> items = new ArrayList<>();
while (iterator.hasNext()) {
Suggest.Suggestion.Entry.Option next = iterator.next();
items.add(new SuggestionResponse(next.getText().string()));
}
return items;
}

Answer 2

paramsMap = req.getParameterMap();
String prefix = getParam("prefix");
if (prefix == null) {
EndpointUtil.badRequest("Autocomplete EndPoint: prefix parameter is missing", resp);
return;
}
SearchRequest searchRequest;
SearchSourceBuilder searchSourceBuilder;
searchRequest = new SearchRequest("section");
searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));
searchSourceBuilder.from(0);
searchSourceBuilder.size(MAX_HITS);
CompletionSuggestionBuilder suggestionBuilder = new CompletionSuggestionBuilder("text.completion")
.prefix(prefix, Fuzziness.AUTO).size(MAX_HITS);
SuggestBuilder suggestBuilder = new SuggestBuilder();
suggestBuilder.addSuggestion(SUGGEST_NAME, suggestionBuilder);
searchSourceBuilder.suggest(suggestBuilder);
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = getElasticClient().search(searchRequest);
Suggest suggest = searchResponse.getSuggest();
List<Document> results = new ArrayList<Document>();
Suggest.Suggestion<Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option>> suggestion
= suggest.getSuggestion(SUGGEST_NAME);
List<Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option>> list = suggestion.getEntries();
for(Suggest.Suggestion.Entry<Suggest.Suggestion.Entry.Option> entry :list) {
List<Suggest.Suggestion.Entry.Option> options = entry.getOptions();
for(Suggest.Suggestion.Entry.Option option : options) {
Document doc = new Document();
doc.append("text",option.getText().toString());
results.add(doc);
}
}
sendJsonResult(results, resp);

Answer 3

But I'm running into the error "field "suggest" doesn't have type 'completion'. My mapping looks like this: code .field("suggest") .startObject() .field("type", "completion") .field("index_analyzer","simple") .field("search_analyzer","simple") .endObject()
It sounds like, that your mapping is not applied correctly. Did you check it out?
Based on the mapping you provided, I think you are missing the properties around your mapping. Try the following mapping:
XContentFactory.jsonBuilder().startObject()
.startObject("properties")
.startObject("suggest")
.field("type", "completion")
.endObject()
.endObject()
.endObject()
Btw, SimpleAnalyzer is the default Analyzer for the suggestions. Thus, you need not define it explicitly.

Answer 4

To anyone who still needs this. The code snippet below works with ES v 6.3:-
CompletionSuggestionBuilder suggestionBuilder = new CompletionSuggestionBuilder("<field_name>").prefix("<search_term>");
SearchRequestBuilder requestBuilder =
oaEsClient.client().prepareSearch("<index_name>").setTypes("<type_name>")
.suggest(new SuggestBuilder().addSuggestion("<suggestion_name>",suggestionBuilder))
.setSize(20)
.setFetchSource(true)
.setExplain(false)
;
SearchResponse response = requestBuilder.get();
Suggest suggest = response.getSuggest();