带有空格的Elasticsearch Nest通配符查询
我想使用Nest编写一个elasticsearch查询,以获取ContentIndexables
已被索引的完整索引项(在我的情况下为自定义类型)。该查询受[somestring] + *(即String.StartsWith())的术语查询的约束,其中[somestring]可能包含空格,也可能不包含空格。
这与CompletionSuggester
由于我需要检索完整对象而不是字符串建议而不同。
当我查询没有空格的文本时,将使用下面的代码返回所需的输出。但是,如果我的搜索词包含空格,则不会返回预期结果。
这是我搜索字段的方式:
var searchResults = _client.Search<ContentIndexable>( body =>
body
.Index(indexName)
.Query(
query =>
query.QueryString(
qs => qs.
OnFields(f => f.Title, f => f.TextContent)
.Query(searchTerm + "*"))));
这是一个单元测试,演示了如何重现该问题:
indexService.IndexUserItemsSync(testGuid, IndexType.submission, new ContentIndexable {
ContentId = Guid.NewGuid(),
TextContent = "Some description",
Title = "title"
});
indexService.IndexUserItemsSync(testGuid, IndexType.submission, new ContentIndexable
{
ContentId = Guid.NewGuid(),
TextContent = "Some description",
Title = "title that is long"
});
indexService.IndexUserItemsSync(testGuid, IndexType.submission, new ContentIndexable
{
ContentId = Guid.NewGuid(),
TextContent = "Some description",
Title = "title that likes"
});
indexService.IndexUserItemsSync(testGuid, IndexType.submission, new ContentIndexable
{
ContentId = Guid.NewGuid(),
TextContent = "Some description",
Title = "titlethat"
});
var searchResult = indexService.SearchUserItems(testGuid, IndexType.submission, 10, "title");
Assert.IsNotNull(searchResult);
// this one works
Assert.AreEqual(4, searchResult.Count());
var searchResult2 = indexService.SearchUserItems(testGuid, IndexType.submission, 10, "title that");
Assert.IsNotNull(searchResult2);
// this one does not!!! searchREsult2.Count() evaluates to 0
Assert.AreEqual(2, searchResult2.Count());
如您所见,然后输入“ title that”,搜索返回为空,而不是我希望返回的两行。
更多信息:我在我的ContentIndexable类型上创建了一个索引:
public class ContentIndexable : IIndexable{
public Guid ContentId { get; set; }
public string Title { get; set; }
public string TextContent { get; set; }
}
使用此代码:
_client.CreateIndex( indexName,
descriptor =>
descriptor.AddMapping<ContentIndexable>(
m => m.Properties(
p => p.Completion(s => s
.Name(n => n.Title)
.IndexAnalyzer("standard")
.SearchAnalyzer("standard")
.MaxInputLength(30)
.Payloads()
.PreserveSeparators()
.PreservePositionIncrements())
.Completion(s => s.Name(n => n.TextContent)
.IndexAnalyzer("standard")
.SearchAnalyzer("standard")
.MaxInputLength(50)
.Payloads()
.PreserveSeparators()
.PreservePositionIncrements())
)));
我什至在索引或查询时都试图转义空白,string.Replace(" ", @"\ ")
但这没有帮助。
将搜索类型更改为通配符也无济于事:
var searchResults = _client.Search<ContentIndexable>( body =>
body
.Index(indexName)
.Query(
query => query.Wildcard(qd => qd.OnField(f => f.Title).Value(searchTerm + "*"))));
有人知道我在做什么错吗?
请注意,我的CompletionSuggester
版本可以使用空格,但不幸的是只能返回字符串。我需要拿出
才能拿到ContentId
。MY CompletionSuggester实施:
public IEnumerable<string> GetAutoCompleteSuggestions(Guid userId, IndexType indexType, int size, string searchTerm) {
string indexName = getIndexName(indexType, userId);
var result = _client.Search<ContentIndexable>(
body => body.Index(indexName)
.SuggestCompletion("content-suggest" + Guid.NewGuid(),
descriptor => descriptor
.OnField(t => t.Title)
.Text(searchTerm)
.Size(size)));
if (result.Suggest == null)
{
return new List<string>();
}
return (from suggest in result.Suggest
from value in suggest.Value
from options in value.Options
select options.Text).Take(size);
}
我知道我可以接受建议,获得全部价值(这将导致我期望的两个项目),然后使用我的第一种方法进行全期匹配,但这需要对ElasticSearch进行2次单独的调用(一个用于完整的建议者和第二个用于术语查询),但理想情况下,如果可能的话,我希望不进行往返。
提前谢谢了,
回答:
这是您如何解决Title
现场问题的示例。
将您的映射更改为类似(或使用MultiField,但我找不到同时将字段映射为字符串和完成的选项):
client.CreateIndex(indexName, i => i .AddMapping<ContentIndexable>(m => m
.Properties(
ps => ps
.Completion(c => c.Name("title.completion")
.IndexAnalyzer("standard")
.SearchAnalyzer("standard")
.MaxInputLength(30)
.Payloads()
.PreserveSeparators()
.PreservePositionIncrements())
.String(s => s.Name(x => x.Title).CopyTo("title.completion")))));
更改SuggestCompletion
为
var result = client.Search<ContentIndexable>(body => body .Index(indexName)
.SuggestCompletion("content-suggest" + Guid.NewGuid(),
descriptor => descriptor
.OnField(t => t.Title.Suffix("completion"))
.Text("title")
.Size(10)));
并QueryString
以
var searchResponse = client.Search<ContentIndexable>(body => body .Index(indexName)
.Query(query => query
.QueryString(
qs => qs
.OnFields(f => f.Title.Suffix("completion"))
.Query("title tha" + "*")
.MinimumShouldMatchPercentage(100))));
该解决方案的问题是事实,我们为Title
字段存储了两次数据。这就是为什么我前面提到使用MultiField很好,但是我无法使用NEST
。
希望这可以帮助。
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