使用“-”查询在 ElasticSearch NEST 7.x 中返回不正确的结果

Question

Here is the query I use to search:

 var response = await client.SearchAsync<MenuForElasticSearch>(searchDescriptor => searchDescriptor
                .Query(queryContainerDescriptor => queryContainerDescriptor
                    .Bool(queryDescriptor => queryDescriptor
                        .Should(queryStringQuery => queryStringQuery.Match(match => match.Field(fld => fld.DisplayName).Query(query)),
                        queryStringQuery => queryStringQuery.Wildcard(wildcard => wildcard.Field(flds => flds.DisplayName).Value($"*{query}*")),
                        queryStringQuery => queryStringQuery.Fuzzy(fuzzy => fuzzy.Field(flds => flds.DisplayName).Value(query)))
                        )));

There are three documents with displayName = NPW-711, NPW-677 and NPW-777. When I search NPW-711 it returns all three documents. Can adding DefaultOperator(Elasticsearch.Net.DefaultOperator.And) help? If yes, where it fits?

Answer 1

Match query with AND operator will give you what you are looking for

var results = await client.SearchAsync<Document>(s => s
    .Query(q => q
        .Match(m => m
            .Field("name")
            .Query(query)
            .Operator(Operator.And))));

output:

Results for query "NPW-777": NPW-777
Results for query "NPW": NPW-711,NPW-677,NPW-777
Results for query "677": NPW-677

Hope that helps.