Query does not support [prefix]

[finau]

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?

[Opster_Community1 (Opster Elasticsearch Expert - Nishant)]

The error clearly states that prefix query does not support prefix parameter. You should replace prefix parameter of title field in the prefix query withvalue. 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"
                ]
              }
            }
          ]
        }
      }
    }
  }
}