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Reindexing using NEST V5.4 - ElasticSearch

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无人及你
无人及你 2021-01-17 06:31

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 =
    elast
1条回答
  • 伪装坚强ぢ
    伪装坚强ぢ (楼主)
    2021-01-17 07:25

    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 Version - 5.4

    var reindex = client.Reindex(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()));



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


    So, you need to add it to your code:
    


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

    


    Useful links to check this are:
    


    Documentation
    


    Issue 2660 on GitHub
    


    Issue 2771 on GitHub
    
    
    
             
    
                                                        
    
            
            
    
              
                
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