# Query does not support \[prefix\]

**URL:** <https://discuss.elastic.co/t/query-does-not-support-prefix/213261>\
**Category:** Elasticsearch\
**Created:** [December 28, 2019, 4:45pm UTC](https://discuss.elastic.co/t/query-does-not-support-prefix/213261 "2019-12-28T16:45:42Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![finau](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/finau/32/60050_2.png) [@finau](https://discuss.elastic.co/u/finau)\
**Post date:** [December 28, 2019, 4:45pm UTC](https://discuss.elastic.co/t/query-does-not-support-prefix/213261/1 "2019-12-28T16:45:42Z")

</div>

When I post the following query, I got an error response

`{"error":{"root_cause":[{"type":"parsing_exception","reason":"[prefix] query does not support [prefix]","line":1,"col":119}],"type":"parsing_exception","reason":"[prefix] query does not support [prefix]","line":1,"col":119},"status":400}`

Here's my POST query:

`{"from":0,"size":10,"sort":{"_score":"desc"},"query":{"bool":{"must":{"bool":{"should":[[{"prefix":{"title":{"prefix":"of","boost":"1.0"}}}],{"multi_match":{"query":"of","fields":["title^1.0"]}},{"query_string":{"query":"(\"of\")","fields":["title^1.0"]}}]}}}}}`

How can I make this query work for my autocomplete search?

---

<div class="post-metadata">

**Author:** ![Opster\_Community1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/opster_community1/32/59062_2.png) [@Opster\_Community1](https://discuss.elastic.co/u/Opster_Community1)\
**Post date:** [December 31, 2019, 4:59am UTC](https://discuss.elastic.co/t/query-does-not-support-prefix/213261/2 "2019-12-31T04:59:15Z")

</div>

The error clearly states that `prefix` query does not support `prefix` parameter. You should replace `prefix` parameter of `title` field in the prefix query with`value`. So the query should be:

```
{
  "from": 0,
  "size": 10,
  "sort": {
    "_score": "desc"
  },
  "query": {
    "bool": {
      "must": {
        "bool": {
          "should": [
            [
              {
                "prefix": {
                  "title": {
                    "value": "of",
                    "boost": "1.0"
                  }
                }
              }
            ],
            {
              "multi_match": {
                "query": "of",
                "fields": [
                  "title^1.0"
                ]
              }
            },
            {
              "query_string": {
                "query": "(\"of\")",
                "fields": [
                  "title^1.0"
                ]
              }
            }
          ]
        }
      }
    }
  }
}
```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 28, 2020, 4:59am UTC](https://discuss.elastic.co/t/query-does-not-support-prefix/213261/3 "2020-01-28T04:59:23Z")

</div>

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