Elastic search fuzziness in query_string

Question

I'm specifying a fuzzy_prefix_length in the query string, but a search for "tes" is not pulling up posts that are titled "test" ... any ideas what I'm doing wrong?

this is my query string setup

"query" : {
  "query_string" : {
    "query" : the-query-string-goes-here,
    "default_operator" : "AND",
    "fuzzy_prefix_length" : 3,
  }
}

imotov · Accepted Answer · 2012-09-17 23:54:24Z

13

You are, probably, missing "fuzzy" operator at the end of the query. Try this:

"query" : {
  "query_string" : {
    "query" : "tes~",
    "default_operator" : "AND",
    "fuzzy_prefix_length" : 3,
  }
}

answered Sep 17, 2012 at 23:54

imotov

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2 Comments

concept47 Over a year ago

Ahh I see ... couple of questions if you don't mind ... I've heard wildcard queries are slower than average and don't scale. Any similar concerns with this operator? Also, right now a search for "tes" will pull up a post titled "test" but a search for "est" won't ... is there a way to make it do this ... or am I overreaching?

imotov Over a year ago

"est" doesn't return any results because you specified non-zero fuzzy_prefix_length. The fuzzy_prefix_length sets the number of characters at the beginning of the term that have to match. Zero fuzzy_prefix_length would require elasticsearch to fuzzy match all terms in the dictionary to the term in your query. By specifying non-zero fuzzy_prefix_length, you can significantly limit the number of terms to check and improve performance. As you mentioned, it's somewhat similar to the wild card queries, except the term matching algorithm is more sophisticated in case of fuzzy operator.

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