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Scripting: Add char position of script errors (#51069)

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Add the character position of a scripting error to error responses.

The contents of the `position` field are experimental and subject to
change.  Currently, `offset` refers to the character location where the
error was encountered, `start` and `end` define a range of characters
that contain the error.

eg.
```
{
  "error": {
    "root_cause": [
      {
        "type": "script_exception",
        "reason": "runtime error",
        "script_stack": [
          "y = x;",
          "     ^---- HERE"
        ],
        "script": "def x = new ArrayList(); Map y = x;",
        "lang": "painless",
        "position": {
          "offset": 33,
          "start": 29,
          "end": 35
        }
      }
```

Refs: #50993

* Check position only for 7.7+

* 7.7 && decrement before assign

* Use correct experimental tag, update doc test responses, off by one yaml

* Do not duplicate error.caused_by in replacement

* Add position under causedby
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Stuart Tettemer 2020-01-21 10:57:09 -07:00 • committed by GitHub
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commit 4a8e5ada23
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11
docs/reference/scripting/using.asciidoc
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@ -241,3 +241,14 @@ NOTE: The size of scripts is limited to 65,535 bytes. This can be
changed by setting `script.max_size_in_bytes` setting to increase that soft
limit, but if scripts are really large then a
<<modules-scripting-engine,native script engine>> should be considered.
[float]
[[modules-scripting-errors]]
=== Script errors
Elasticsearch returns error details when there is a compliation or runtime
exception. The contents of this response are useful for tracking down the
problem.
experimental[]
The contents of `position` are experimental and subject to change.