Phrase suggestion not returning any values

Elastic Stack Elasticsearch
1

Hi there, im trying to get a phrase suggester to work - So far, im not very successfull!

I basically followed the guide in the docs - https://www.elastic.co/guide/en/elasticsearch/reference/current/search-suggesters-phrase.html

with a few differences:
title.trigram = title.suggest

Heres are some documents to show you some structure \ expected results:

{
    "_index": "myIndex",
    "_type": "article",
    "_id": "b5893c47-7bbc-4eb1-b96e-3d621639d591",
    "_score": 0.71896636,
    "_source": {
        "title": "Alloy Meet"
    }
},
    {
    "_index": "myIndex",
    "_type": "article",
    "_id": "8b2eafb2-c8d5-41d0-a561-a525d42a38b2",
    "_score": 0.6925415,
    "_source": {
        "title": "Enhances Risk Management"
    }
},
    {
    "_index": "myIndex",
    "_type": "article",
    "_id": "673903fe-8562-4c46-9cca-b90dd6ed41e2",
    "_score": 0.6597031,
    "_source": {
        "title": "Alloy Saves Bears"
    }
},
    {
    "_index": "myIndex",
    "_type": "article",
    "_id": "30f44007-6cea-4d4d-b730-07f006f5dcdf",
    "_score": 0.61461323,
    "_source": {
        "title": "Download Alloy Track"
    }
},
{
    "_index": "myIndex",
    "_type": "article",
    "_id": "1c4af28b-fb26-42e5-8d8e-cc3dbe72d2f6",
    "_score": 0.61090285,
    "_source": {
        "title": "Alloy Track"
    }
},

Backend code

  • Settings up the index template - This seems to work properly when inspecting the mapping:

      var result = _client.PutIndexTemplate("myindextemplate",
  it => it
  .Template("myindex_*")
  .Settings(settings => settings

      // Analyzers
      .Analysis(ana => ana
          .Analyzers(a => a
              .Custom("trigram", tri => tri
                  .Filters("standard", "shingle")
                  .Tokenizer("standard")
              )
              .Custom("reverse", tri => tri
                  .Filters("standard", "reverse")
                  .Tokenizer("standard")
              )
          )
          .TokenFilters(tf => tf
              .Shingle("shingle", shi => shi
                  .MinShingleSize(2)
                  .MaxShingleSize(3)
              )
          )
      )
  )

  //Mappings
  .Mappings(m => m
      .Map < art > (map => map
          .AutoMap(0)
          .Properties(prop => prop
              .Text(p => p
                  .Name(o => o.Language)
              )
              .Text(p => p
                  .Name(o => o.ContentLink)
              )
              .Text(p => p
                  .Name(o => o.Title)
                  .Fields(o => o
                      .Text(oo => oo
                          .Name("suggest")
                          .Analyzer("trigram")
                      )
                      .Text(oo => oo
                          .Name("reverse")
                          .Analyzer("reverse")
                      )
                  )
              )
          )
      )
  ));

The search, done in Kibana:

POST /myIndex/_search
{
  "suggest": {
    "text" : "all meet",
    "simple_phrase" : {
      "phrase" : {
        "field" :  "title.suggest",
        "real_word_error_likelihood": 0.10,
        "size" :   5,
        "direct_generator" : [ {
          "field" :            "title.suggest",
          "suggest_mode" :     "always",
          "min_word_length" :  1
        } ],
        "collate": {
          "query": { 
            "inline" : {
              "match": {
                "{{field_name}}" : "{{suggestion}}" 
              }
            }
          },
          "params": {"field_name" : "title"}, 
          "prune": true 
        }
      }
    }
  }
}

Search Response

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 15,
    "successful": 15,
    "failed": 0
  },
  "hits": {
    "total": 0,
    "max_score": 0,
    "hits": []
  },
  "suggest": {
    "simple_phrase": [
      {
        "text": "all meet",
        "offset": 0,
        "length": 8,
        "options": []
      }
    ]
  }
}

Expected result:

I would expect "all" to be corrected to "alloy"

Appreciate any help!

2

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