Add setting plugins.query.executionengine.async_query.enabled

[penghuo]

Description

• add new settings plugins.query.executionengine.async_query.enabled which disable submit async query to reject all coming requests.

Issues Resolved

#2507

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2a3ebea) 95.41% compared to head (671ca08) 95.41%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2510   +/-   ##
=========================================
  Coverage     95.41%   95.41%           
- Complexity     5026     5027    +1     
=========================================
  Files           483      483           
  Lines         14005    14016   +11     
  Branches        944      944           
=========================================
+ Hits          13363    13374   +11     
  Misses          621      621           
  Partials         21       21           

Flag	Coverage Δ
sql-engine	95.41% <100.00%> (+<0.01%)	⬆️

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[noCharger]

@penghuo can we disable async_query by "plugins.query.executionengine.async_query": {}

[penghuo]

@penghuo can we disable async_query by "plugins.query.executionengine.async_query": {}

no.

curl --request PUT \
  --url http://localhost:9200/_cluster/settings \
  --header 'content-type: application/x-ndjson' \
  --data '{"transient":{"plugins.query.executionengine.async_query.enabled":{}}}'
* empty
{
  "error": {
    "root_cause": [
      {
        "type": "action_request_validation_exception",
        "reason": "Validation Failed: 1: no settings to update;"
      }
    ],
    "type": "action_request_validation_exception",
    "reason": "Validation Failed: 1: no settings to update;"
  },
  "status": 400
}

• empty string

curl --request PUT \
  --url http://localhost:9200/_cluster/settings \
  --header 'content-type: application/x-ndjson' \
  --data '{"transient":{"plugins.query.executionengine.async_query.enabled":""}}'

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "Failed to parse value [] as only [true] or [false] are allowed."
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "Failed to parse value [] as only [true] or [false] are allowed."
  },
  "status": 400
}

[dai-chen]

IllegalAccessException seems a Java reflection related exception?