Pipeline error {:pipeline_id=>"main", :exception=>#<LogStash::Json::ParserError: Unexpected character (':' (code 58)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')

Hello friends, I want to add some data to a new index according to a query from an existing index in Elasticsearch. But I am facing a problem while doing this, I would be very happy if you could help me.
my conf file:

input {
  elasticsearch {
            hosts => "localhost:9200"	
            index => "my_old_index_name"
            user => "my_username"
            password => "my_password"	
            docinfo => true
            query => '"_source": ["BuyerName","ImportCountryName"] , "query": {"bool": {"must": [{"match": {"ImportCountryName": ""}},{"wildcard": {"BuyerName": {"value": "sanayi"}} , "case_insensitive":true}]}}' 
	}
}
filter { 
    mutate{
	  remove_field => ["@timestamp","@version"]
	}
    fingerprint {
        key => "my_key"
        method => "MD5"
        source => ["BuyerName"]
        target => "[@metadata][generated_id]"
    }	    
}
 
output {
    stdout { codec => dots }
     elasticsearch {
	    hosts => "localhost:9200"	
        index => "my_new_index_name"
        document_id =>  "%{[@metadata][generated_id]}"
		user => "my_user_name"
        password => "my_password"	
    }
}

Actually this query works on kibana. I checked this.

GET my_old_index_name/_search
{
  "_source": ["BuyerName","ImportCountryName"] ,
  "query": {
    "bool": {
      "must": [
        {"match": {
          "ImportCountryName": ""
        }},
        {"wildcard": {
          "BuyerName": {
            "value": "sanayi",
            "case_insensitive":true
          }
        }}
       ]
    }
  }
}

However, there is a problem with this query based on the error message.
Error Message:

[ERROR][logstash.javapipeline ][main] Pipeline error {:pipeline_id=>"main", :exception=>#<LogStash::Json::ParserError: Unexpected character (':' (code 58)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: (byte)""_source": ["BuyerName","ImportCountryName"] , "query": {"bool": {"must": [{"match": {"ImportCountryName": ""}},{"wildcard": {"BuyerName": {"value": "sanayi"}},"case_insensitive":true}]}}"; line: 1, column: 11]>}

Any ideas will help me a lot thanks in advance. :hugs:

Maybe putting this in curly brackets '{......}'