Creating an index Nest

elasticsearch, elasticsearch-analyzers, elasticsearch-mapping, indexing, nest

Solution

Creating an index in older versions

There are two main ways that you can accomplish this as outlined in the Nest Create Index Documentation:

Here is the way where you directly declare the index settings as Fluent Dictionary entries. Just like you are doing in your example above. I tested this locally and it produces the index settings that match your JSON above.

        var response = client.CreateIndex(indexName, s => s
          .NumberOfReplicas(replicas)
          .NumberOfShards(shards)
          .Settings(settings => settings
             .Add("merge.policy.merge_factor", "10")
             .Add("search.slowlog.threshold.fetch.warn", "1s")
             .Add("mapping.allow_type_wrapper", true)
             .Add("analysis.filter.trigrams_filter.type", "nGram")
             .Add("analysis.filter.trigrams_filter.min_gram", "3")
             .Add("analysis.filter.trigrams_filter.max_gram", "3")
             .Add("analysis.analyzer.trigrams.type", "custom")
             .Add("analysis.analyzer.trigrams.tokenizer", "standard")
             .Add("analysis.analyzer.trigrams.filter.0", "lowercase")
             .Add("analysis.analyzer.trigrams.filter.1", "trigrams_filter")
           )
           .AddMapping<Object>(mapping => mapping
              .Type("data")
              .AllField(af => af.Enabled())
              .Properties(prop => prop
                 .String(sprop => sprop
                   .Name("text")
                   .IndexAnalyzer("trigrams")
                  )
               )
           )
       );

Please note that NEST also includes the ability to create index settings using strongly typed classes as well. I will post an example of that later, if I have time to work through it.

Creating index with NEST 7.x

Please also note that in NEST 7.x `CreateIndex` method is removed. Use `Indices.Create` isntead. Here's the example.

_client.Indices
    .Create(indexName, s => s
        .Settings(se => se
            .NumberOfReplicas(replicas)
            .NumberOfShards(shards)
            .Setting("merge.policy.merge_factor", "10")));

Problem

How would I recreate the following index using Elasticsearch Nest API? Here is the json for the index including the mapping: ``` { "settings": { "analysis": { "filter": { "trigrams_filter": { "type": "ngram", "min_gram": 3, "max_gram": 3 } }, "analyzer": { "trigrams": { "type": "custom", "tokenizer": "standard", "filter": [ "lowercase", "trigrams_filter" ] } } } }, "mappings": { "data": { "_all" : {"enabled" : true}, "properties": { "text": { "type": "string", "analyzer": "trigrams" } } } } } ``` Here is my attempt: ``` var newIndex = client.CreateIndexAsync(indexName, index => index .NumberOfReplicas(replicas) .NumberOfShards(shards) .Settings(settings => settings .Add("merge.policy.merge_factor", "10") .Add("search.slowlog.threshold.fetch.warn", "1s") .Add("mapping.allow_type_wrapper", true)) .AddMapping<Object>(mapping => mapping .IndexAnalyzer("trigram") .Type("string")) ); ``` The documentation does not mention anything about this? UPDATE: Found this post that uses `var index = new IndexSettings()` and then adds Analysis with the string literal json. `index.Add("analysis", @"{json});` Where can one find more examples like this one and does this work?

Original source

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