我升级自：
...和我的Nest查询做一个MatchPhrasePrefix停止返回结果。
该软件是网页的搜索引擎，其中一项功能可以让您将结果限制为以特定路径开头的网址，例如http://example.com/blog，只能查看搜索结果中的博客帖子。
我有一个mainQuery工作正常。如果用户提供urlStartstWith值，则mainQuery与bool / MatchPhrasePrefix查询一起获得。
索引包含100到1000个文档。
我试过的东西不起作用：
.Operator(Operator.And)，因为在此版本的NEST中不存在（导致编译错误）urlStartstWith.MinimumShouldMatch(1)线如果我针对旧的ElasticSearch版本2.0服务器运行使用新NEST库构建的此查询，则它可以正常工作。所以我认为ElasticSearch本身已经发生了变化。
查询
var urlStartWithFilter = esQuery.Bool(b =>
b.Filter(m =>
m.MatchPhrasePrefix(pre =>
pre
//.MaxExpansions(5000) //did nothing
//.Operator(Operator.And) //does not exist in new version of NEST
.Query(urlStartsWith)
.Field(f => f.Url))
)
.MinimumShouldMatch(1)
);
mainQuery = mainQuery && urlStartWithFilter;
如要求 - 开始完成示例
这是一个显示问题的示例，与我查询实际项目的网页索引的方式非常接近。
获取正在运行的ElasticSearch 6.6.1实例。你可以通过以下方式在docker中完成：
docker pull docker.elastic.co/elasticsearch/elasticsearch:6.6.1
docker network create esnetwork --driver=bridge
docker run -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" --name elasticsearch -d --network esnetwork docker.elastic.co/elasticsearch/elasticsearch:6.6.1
创建一个新的.Net Framework 4.6.1控制台应用程序。将以下内容粘贴到Program.cs中
using Nest;
using System;
using System.Collections.Generic;
namespace Loader
{
class Program
{
const string ELASTIC_SERVER = "http://localhost:9200";
const string DEFAULT_INDEX = "stack_overflow_api";
private static Uri es_node = new Uri(ELASTIC_SERVER);
private static ConnectionSettings settings = new ConnectionSettings(es_node).DefaultIndex(DEFAULT_INDEX);
private static ElasticClient client = new ElasticClient(settings);
private static bool include_starts_with = true;
static void Main(string[] args)
{
WriteMainMenu();
}
static void WriteMainMenu()
{
//Console.Clear();
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("What to do?");
Console.WriteLine("1 - Load Sample Data into ES");
Console.WriteLine("2 - Run a query WITHOUT StartsWith");
Console.WriteLine("3 - Run a query WITH StartsWith");
Console.WriteLine("[Enter] to exit.");
Console.WriteLine("");
Console.WriteLine("");
var option = Console.ReadLine();
if (option == "1")
{
LoadSampleData();
}
else if (option == "2")
{
include_starts_with = false;
RunStartsWithQuery();
}
else if (option == "3")
{
include_starts_with = true;
RunStartsWithQuery();
}
//- exit
}
private static void LoadSampleData()
{
var existsResponse = client.IndexExists(DEFAULT_INDEX);
if (existsResponse.Exists) //delete existing mapping (and data)
{
client.DeleteIndex(DEFAULT_INDEX);
}
var rebuildResponse = client.CreateIndex(DEFAULT_INDEX, c => c.Settings(s => s.NumberOfReplicas(1).NumberOfShards(5)));
var response2 = client.Map<Item>(m => m.AutoMap());
var data = GetSearchResultData();
Console.WriteLine($"Indexing {data.Count} items...");
var response = client.IndexMany<Item>(data);
client.Refresh(DEFAULT_INDEX);
WriteMainMenu();
}
private static List<Item> GetSearchResultData()
{
var jsonPath = System.IO.Path.Combine(Environment.CurrentDirectory, "StackOverflowSampleJson.json");
var jsondata = System.IO.File.ReadAllText(jsonPath);
var searchResult = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Item>>(jsondata);
return searchResult;
}
private static void RunStartsWithQuery()
{
Console.WriteLine("Enter a search query and press enter, or just press enter to search for the default of 'Perl'.");
var search = Console.ReadLine().ToLower();
if (string.IsNullOrWhiteSpace(search))
{
search = "Perl";
}
Console.WriteLine($"Searching for {search}...");
var result = client.Search<Item>(s => s
.Query(esQuery => {
var titleQuery = esQuery.Match(m => m
.Field(p => p.title)
.Boost(1)
.Query(search)
);
var closedReasonQuery = esQuery.Match(m => m
.Field(p => p.closed_reason)
.Boost(1)
.Query(search)
);
// search across a couple fields
var mainQuery = titleQuery || closedReasonQuery;
if (include_starts_with)
{
var urlStartsWith = "https://stackoverflow.com/questions/";
var urlStartWithFilter = esQuery.Bool(b =>
b.Filter(m =>
m.MatchPhrasePrefix(pre =>
pre
//.MaxExpansions(5000) //did nothing
//.Operator(Operator.And) //does not exist in new version of NEST
.Query(urlStartsWith)
.Field(f => f.link))
)
.MinimumShouldMatch(1)
);
mainQuery = mainQuery && urlStartWithFilter;
}
return mainQuery;
})
);
if (result.IsValid == false)
{
Console.WriteLine("ES Query had an error");
}
else if (result.Hits.Count > 0)
{
Console.ForegroundColor = ConsoleColor.DarkGreen;
Console.WriteLine($"Found {result.Hits.Count} results:");
foreach (var item in result.Hits)
{
Console.WriteLine($" {item.Source.title}");
}
Console.ForegroundColor = ConsoleColor.White;
}
else
{
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.WriteLine($"Found 0 results");
Console.ForegroundColor = ConsoleColor.White;
}
WriteMainMenu();
}
}
public class Item
{
public List<string> tags { get; set; }
//public Owner owner { get; set; }
public bool is_answered { get; set; }
public int view_count { get; set; }
public int answer_count { get; set; }
public int score { get; set; }
public int last_activity_date { get; set; }
public int creation_date { get; set; }
public int last_edit_date { get; set; }
public int question_id { get; set; }
public string link { get; set; }
public string title { get; set; }
public int? accepted_answer_id { get; set; }
public int? closed_date { get; set; }
public string closed_reason { get; set; }
public int? community_owned_date { get; set; }
}
}
StackOverflowSampleJson.json以输出到构建目录，方法是右键单击它，选择属性，然后将Copy to Output Directory更改为Always1 - Load Sample Data into ES来填充索引2 - Run a query WITHOUT StartsWith运行查询而不使用StartsWith / MatchPhrasePrefix查看正常查询是否有效3 - Run a query WITH StartsWith以查看包含该额外查询会使结果计数为零。好吧，我真的不明白为什么旧的查询适用于elasticsearch 2.0而不是elasticsearch 6.6，但是将内部查询更改为此已经使它适用于ES2和ES6：
if (include_starts_with)
{
var urlStartsWith = "https://stackoverflow.com/questions/";
var urlStartWithFilter = esQuery.MatchPhrasePrefix(pre => pre
.Query(urlStartsWith)
.Field(f => f.link)
);
mainQuery = mainQuery && urlStartWithFilter;
}