Elastic Search Closest match with space in fields

Question

I have data in elasticsearch fields which contains "face mask", I am able to fetch this data with the following query with search_term set to "face", "face mask", "mask" and "face masks".

{
    "query": {
        "bool": {
            "must": [{
                "multi_match": {
                    "query": ${search_term},
                    "fields": [
                        "title^4",
                        "titleNgram^3",
                    ],
                    "fuzziness": "auto"
                }
            }]
        }
    }
}

What I am not able to achieve is when I query for "facemask" (no spaces in search_term) it does not return any document containing "face" or "mask", but, it returns documents with fields containing "facewash". Is there a way to achieve it?

Mapping is shared below

{
    "mappings": {
        "_doc": {
            "properties": {
                "title": {
                    "type": "text"
                },
                "titleNgram": {
                    "search_analyzer": "whitespace_analyzer",
                    "analyzer": "nGram_analyzer",
                    "type": "text"
                },
                "id": {
                    "index": false,
                    "type": "text"
                }
            }
        }
    }
}

Can you share the mapping too? – Joe - GMapsBook.com Jul 22 '20 at 12:51 — Joe - GMapsBook.com, Jul 22 '20 at 12:51

Amit · Accepted Answer · 2020-07-22T13:15:21.820

1

You can try removing the "search_analyzer": "whitespace_analyzer", and reindex the data and use the same query and it should return you the expected results.

{
    "mappings": {
        "_doc": {
            "properties": {
                "title": {
                    "type": "text"
                },
                "titleNgram": {
                    "search_analyzer": "whitespace_analyzer", --> remove this line.
                    "analyzer": "nGram_analyzer",
                    "type": "text"
                },
                "id": {
                    "index": false,
                    "type": "text"
                }
            }
        }
    }
}

Edit: I tested it locally and it worked for me, below is the sample I used

Search query

{
  "query": {
    "multi_match": {
      "query": "face mask",
      "fields": [
        "titlengram",
        "title"
      ]
    }
  }
}

And it gives your expected doc

 "hits": [
      {
        "_index": "ngram",
        "_type": "_doc",
        "_id": "1",
        "_score": 2.3014567,
        "_source": {
          "title": "face mask",
          "titlengram": "face mask"
        }
      }

edited Jul 22 '20 at 13:15

answered Jul 22 '20 at 12:59

Amit

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My query string is "facemask" without any spaces. It is not working for me. I changed the mapping, can you check that? – yousuf iqbal Jul 22 '20 at 13:17
@yousufiqbal i checked with my `facemask` and it gives me search result, I can't see your updated mapping without search analyzer – Amit Jul 22 '20 at 13:24
1

It worked, thanks. I was not updating mapping correctly. – yousuf iqbal Jul 22 '20 at 13:37
@yousufiqbal glad it helped – Amit Jul 22 '20 at 13:49
Thanks! I am getting face mask, but the score is less than face wash, any idea regarding it? – yousuf iqbal Jul 22 '20 at 14:22

Elastic Search Closest match with space in fields

1 Answers1