Search templates {{#toJson}} with arrays: unexpected character

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1

I'm trying to parameterize _source in a search template but I'm encountering an error.

This is my template:

PUT _scripts/stored-script
{
  "script": {
    "lang": "mustache",
    "source": {
      "_source": "{{#toJson}}fields{{/toJson}}"
    }
  }
}

GET myIndex/_search/template
{
  "id": "stored-script",
  "params": {
    "fields": ["test", "title"]
  }
}

I'm getting the following error:

{
  "error" : {
    "root_cause" : [
      {
        "type" : "json_parse_exception",
        "reason" : "Unexpected character ('t' (code 116)): was expecting comma to separate Object entries\n at [Source: (StringReader); line: 1, column: 16]"
      }
    ],
    "type" : "json_parse_exception",
    "reason" : "Unexpected character ('t' (code 116)): was expecting comma to separate Object entries\n at [Source: (StringReader); line: 1, column: 16]"
  },
  "status" : 400
}

According to this stackoverflow, this should work.

Am I missing something?

2

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