improve: show actual error line when query has error

[YusukeHosonuma]

In current, error line number is fixed 1 when query has error.
This PR is improve that show actual error line number.

For example, below query has syntax error.

GET /library/book/_search
{
  "query": {
    "field":{
      "title": "test"
    }
  }
}

Current: error line number is fixed 1.

...
[Response]

{
  "error": {
    "root_cause": [
      {
        "type": "parsing_exception",
        "reason": "no [query] registered for [field]",
        "line": 1,
        "col": 19
      }
    ],
    "type": "parsing_exception",
    "reason": "no [query] registered for [field]",
    "line": 1,
    "col": 19
  },
  "status": 400
}

After merged this PR:

...
[Response]

{
  "error": {
    "root_cause": [
      {
        "type": "parsing_exception",
        "reason": "no [query] registered for [field]",
        "line": 4,
        "col": 13
      }
    ],
    "type": "parsing_exception",
    "reason": "no [query] registered for [field]",
    "line": 4,
    "col": 13
  },
  "status": 400
}

Please consider merging if you do not mind.

regards.

[jitcoder]

thank you for the PR! i will take a look today and create a patch today/tomorrow.

[YusukeHosonuma]

I'm glad if you check it when you have time. (This is a reminder)

[jitcoder]

there are some things in there that I wanted to change but unfortunately I did not have enough time so I'm merging this anyways :)