# Query\_string performance issue

**URL:** <https://discuss.elastic.co/t/query-string-performance-issue/86818>\
**Category:** Elasticsearch\
**Created:** [May 23, 2017, 1:32pm UTC](https://discuss.elastic.co/t/query-string-performance-issue/86818 "2017-05-23T13:32:12Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![baltendo](https://avatars.discourse-cdn.com/v4/letter/b/9de053/32.png) [@baltendo](https://discuss.elastic.co/u/baltendo)\
**Post date:** [June 16, 2017, 9:51am UTC](https://discuss.elastic.co/t/query-string-performance-issue/86818/4 "2017-06-16T09:51:04Z")

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Hi @dakrone!

We fixed our performance issues when using Kibana by specifying a default query field. So I think this changes also influences the data that you want me to post here, right?

Nevertheless this is the result for the `query_string` approach:

```auto
{
      "index": "yourindex",
      "valid": true,
      "explanation": """+ConstantScore(_field_names:yourFieldName) +ConstantScore(_field_names:yourFieldName) +MatchNoDocsQuery["User requested "match_none" query."]"""
}

```

And for the none `query_string` approach:

```auto
{
      "index": "yourindex",
      "valid": true,
      "explanation": """MatchNoDocsQuery["User requested "match_none" query."]"""
}

```

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_[View the full topic](https://discuss.elastic.co/t/query-string-performance-issue/86818)._