使用NEST V5.4重新编制索引 - ElasticSearch [英] Reindexing using NEST V5.4 - ElasticSearch

问题描述

我对ElasticSearch很新。我正在尝试重新索引索引以重命名它。我正在使用NEST API v5.4。
我看到了这个例子：

I'm quite new to ElasticSearch. I'm trying to reindex a index in order to rename it. I'm using NEST API v5.4. I saw this example:

var reindex =
    elasticClient.Reindex<Customer>(r =>
        r.FromIndex("customers-v1")
            .ToIndex("customers-v2")
            .Query(q => q.MatchAll())
            .Scroll("10s")
            .CreateIndex(i =>
                i.AddMapping<Customer>(m =>
                    m.Properties(p =>
                        p.String(n => n.Name(name => name.Zipcode).Index(FieldIndexOption.not_analyzed))))));

来源： http://thomasardal.com/elasticsearch-migrations-with-c-and-nest/

但是，我无法使用NEST 5.4重现这一点。我认为这是2.4版本。
我检查ElasticSearch的重大变化并尝试使用以下方法重新编制索引：

However, I can't reproduce this using NEST 5.4. I think that is to version 2.4. I check the breaking changes of ElasticSearch and try reindexing using this:

来源： https://www.elastic.co/guide/en/elasticsearch /client/net-api/current/nest-breaking-changes.html

public method Nest.ReindexDescriptor..ctor Declaration changed (Breaking)
2.x: public .ctor(IndexName from, IndexName to) 5.x: public .ctor()

var reindex = new client.Reindex(oldIndexName, newIndexName);

但这也不起作用。
我也搜索文档，但我没有在c＃上找到任何代码，只是JSON
来源： https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html ）

But this did not work too. I also search for documentation but i didn't find any code on c#, just JSON Source: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html)

有人能举例说明如何在C＃上使用NEST 5.4重新索引吗？

提前致谢！ ：slight_smile：

Thanks in advance! :slight_smile:

推荐答案

搜索了2天后，我找到了重新索引索引的解决方案。为了解决未来的问题，我将提供我的解决方案。

After search for 2 long days I found out the solution to reindex a index. In order to solve future problems, I'll provide my solution.

Nest版本 - 5.4

Nest Version - 5.4

var reindex = client.Reindex<object>(r => r
              .BackPressureFactor(10)
              // ScrollAll - Scroll all the documents of the index and store it for 1minute 
              .ScrollAll("1m", 2, s => s
                  .Search(ss => ss
                      .Index(oldIndexName)
                          .AllTypes())
                      // there needs to be some degree of parallelism for this to work
                      .MaxDegreeOfParallelism(4))
              .CreateIndex(c => c
                  // New index here
                  .Index(newIndexName)
                  .Settings(
                      // settings goes here)
                  .Mappings(
                      // mappings goes here))
              .BulkAll(b => b
                  // New index here!
                  .Index(newIndexName)
                  .Size(100)
                  .MaxDegreeOfParallelism(2)
                  .RefreshOnCompleted()));

ReIndex方法返回一个冷 IObservable ，你必须在其上调用。订阅（）以启动所有内容。

the ReIndex method returns a cold IObservable on which you have to call .Subscribe() to kick off everything.

因此，您需要将其添加到您的代码中：

So, you need to add it to your code:

var o = new ReindexObserver(
            onError: (e) => { //do something },
            onCompleted: () => { //do something });
reindex.Subscribe(o);

检查此信息的有用链接是：

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