CODEWITHSUNDEEP
c#elasticsearchnest
Ethan Schofer
Ethan Schofer

Reputation: 1848

Nest and Elastic Search - Mapping

I am trying to map multiple analyzers to a field in my elastic type. If I use an ElasticAttribute to map an analyzer:

[ElasticProperty(Analyzer = "fulltext")]
public string LongDescription { get; set; }

and I look at the request created I get:

"name": {
      "type": "string",
      "analyzer": "fulltext"
    },

In order to map multiple analyzers to the same field, I use Fluent mapping and add a multifield:

.Properties(prop => prop
                    .MultiField(mf => mf
                        .Name(p => p.Name)
                        .Fields(f => f
                            .String(
                                s =>
                                    s.Name(n => n.Name)
                                        .IndexAnalyzer("autocomplete_analyzer")
                                        .IncludeInAll(false)
                                        .Index(FieldIndexOption.not_analyzed))
                            .String(
                                s =>
                                    s.Name(n => n.Name)
                                        .IndexAnalyzer("fulltext")
                                        .IncludeInAll(false)
                                        .Index(FieldIndexOption.not_analyzed))
                        )
                    )
                )

The request generated looks like this:

 "name": {
      "type": "multi_field",
      "fields": {
        "name": {
          "type": "string",
          "index": "not_analyzed",
          "index_analyzer": "autocomplete_analyzer",
          "include_in_all": false
        },
        "name": {
          "type": "string",
          "index": "not_analyzed",
          "index_analyzer": "fulltext",
          "include_in_all": false
        }
      }
    },

I am specifically interested in the "analyzer"/"index_analyzer" properties. With fluent mapping, I can only set IndexAnalyzer or SearchAnalyzer. I understand the difference between IndexAnalyzer and SearchAnalyzer, but what is the "analyzer" property when I use an ElasticAttribute? Does that just mean the Index and Search are set the same?

Upvotes: 1

Views: 4923

Answers (1)

Martijn Laarman
Martijn Laarman

Reputation: 13536

Just specifying analyzer is indeed setting index_analyzer and search_analyzer at the same time. analyzer is an elasticsearch property and not some magic behavior from NEST.

The fluent mapping is missing the .Analyzer() method, this is now added in 1.0!

Upvotes: 3

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