private static QueryContainer MakeQuery(EssaySearchRequest searchRequest, QueryContainerDescriptor <EssayDocument> q)
{
return(q.Bool(b => b
.Filter(f => f
.Terms(t => t
.Name("termsToMatch")
.Field(ed => ed.Terms)
.Terms(searchRequest.Terms)))
.Must(m => m
.MultiMatch(dm => dm
.Query(searchRequest.Query)
.Fields(fld => fld
.Field(ed => ed.Title, 2)
.Field(ed => ed.Content))
.TieBreaker(0.3)))));
}
/// <summary>
/// Searches essays using terms aggregate.
///
/// <remarks>
/// Size parameter is used with an exact value to eliminate accuracy error arizing from shard recombination.
/// https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html#_size
/// </remarks>
/// </summary>
public async Task <EssaySearchResponse> SearchEssays(EssaySearchRequest searchRequest)
{
var client = _setup.GetClient();
var result = await client.SearchAsync <EssayDocument>(
sd => sd
.Query(q => MakeQuery(searchRequest, q))
.Source(MakeSource)
.Aggregations(MakeAggregations));
var facets = result.Aggs.Terms <string>(MatchedTermsAggregateIdentifier);
var essaySearchResponse = new EssaySearchResponse(
result.Hits.Select(x => new EssayBrief(Guid.Parse(x.Id), x.Source.Title)).ToList(),
facets.Buckets.Select(kb => new TermBucket(kb.Key, kb.DocCount.GetValueOrDefault())).ToList());
return(essaySearchResponse);
}
public async Task <EssaySearchResponse> Get(string query, [FromQuery] string[] themes)
{
var searchRequest = new EssaySearchRequest(query, themes);
return(await _indexer.SearchEssays(searchRequest));
}