[percolate_query] mapping for `percolator type` in script(painless)

Elastic Stack Elasticsearch
1

Hello

I'm Checking how to update "percolate query" > "percolator type" field through _update_by_query.
But,

# Create Index
PUT test_shlee_percolate_20230619
{
  "mappings": {
    "properties": {
      "pa001": {
        "type": "percolator"
      },
      "a001":{
        "type": "keyword"
      }
    }
  }
}

# PUT doc
PUT test_shlee_percolate_20230619/_doc/1
{
  "query": {
    "query_string":{
      "query":"a001:(\"value\")"
    }
  }
}

To create a field with "update_by_query" on this

POST test_shlee_percolate_20230619/_update_by_query?wait_for_completion=false
{
  "script": {
    "source": "ctx._source.query.query_string.query = \"pa001:(ctx._source.a001)\"",
    "lang": "painless"
  }
}

I'm thinking of it in this way.
But,

# error msg
  "error": {
    "type": "script_exception",
    "reason": "runtime error",
    "script_stack": [
      "ctx._source.query.query_string.query = \"pa001:(ctx._source.a001)\"",
      "                 ^---- HERE"
    ],
    "script": "ctx._source.query.query_string.query = \"pa001:(ctx._source.a001)\"",
    "lang": "painless",
    "position": {
      "offset": 17,
      "start": 0,
      "end": 65
    },
    "caused_by": {
      "type": "null_pointer_exception",
      "reason": "cannot access method/field [query_string] from a null def reference"
    }
  }

In the right side of 'script > source', :(colon) cannot be compiled.
Is there any other way?
OR
Is it some kind of bug or undeveloped?

2

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