elasticsearch completion suggest on multifield

Question

I'm trying to get suggestions from a multifield. I can't find examples like this, so maybe it's not the best idea, but I'm interested in your opinion.

mapping:

POST /authors
    {
       "mappings": {
          "author": {
             "properties": {
                "name": {
                   "type": "multi_field",
                   "fields": {
                      "name": {
                         "type": "string",
                         "index": "analyzed"
                      },
                      "ac": {
                         "type": "completion",
                         "index_analyzer": "simple",
                         "search_analyzer": "simple",
                         "payloads": true
                      }
                   }
                }
             }
          }
       }
    }

data:


POST /authors/author/1
    {
       "name": "Fyodor Dostoevsky"
    }

query:

POST /authors/_suggest

    {
       "authorsAutocomplete": {
          "text": "fyodor",
          "completion": {
             "field": "name.ac"
          }
       }
    }

Requirements are:

get query works with text "fyodor" and also with "dostoevsky", this example works only with "fyodor"
be enable to filter suggestions

any ideas how can I achieve these?

Remove index_analyzer and search_analyzer from the mapping . keep it only of type completion.. — Akash Yadav, Sep 19 '14 at 14:27

score 3 · Accepted Answer · edited Nov 08 '20 at 16:26

Firstly, the suggesters don't work well in multi-fields, so you could want to put it outside. Secondly, to make you query work with both the name and firstname, you have to choose the outputs/inputs in when indexing the data.

Example of working code for SENSE:

POST authors

PUT authors/_mapping/author
{
    "properties" : {
        "name" : { "type" : "string" },
        "suggest" : { "type" : "completion"}
    }
}

POST authors/author/1
{
    "name": "Fyodor Dostoevsky",
    "suggest": {
        "input": ["Dostoevsky", "Fyodor"],
        "output": "Fyodor Dostoevsky"
    }
}

POST authors/_suggest
{
    "authorsAutocomplete": {
        "text": "d",
        "completion": {
            "field": "suggest"
        }
    }
}

DELETE authors

Result:

{
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "authorsAutocomplete": [
        {
            "text": "d",
            "offset": 0,
            "length": 1,
            "options": [
                {
                    "text": "Fyodor Dostoevsky",
                    "score": 1
                }
            ]
        }
    ]
}

Filters are not available for suggestions. To implement some kind of filtering, you can look at this blog post about the use of context in suggestions.

Thanks for the answer. Is there possible to apply different weightings for name and first name like you can with regular queries? — Harry Wang, Jan 30 '15 at 15:29
Hi @Harry. Explaining this in detail would be outside the scope of this question and would make this thead quite messy. You can have a look [here](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/_boosting_query_clauses.html) or ask a new question and ask me to answer it. Regards, Heschoon — Heschoon, Jan 31 '15 at 11:02
Thanks a lot, @Heschoon! The article is helpful but I'm still unsure how to make it work for completion suggester specifically. Any chance you can answer my [question](http://stackoverflow.com/q/28268418/2926423)? — Harry Wang, Feb 01 '15 at 21:59

elasticsearch completion suggest on multifield

1 Answers1