Doctest fix in protocol

[MitchellGale]

Description

Fixes error in protocol.rst test.

Old:

  "error": {
    "reason": "Error occurred in OpenSearch engine: no such index [unknown]",
    "details": "org.opensearch.index.IndexNotFoundException: no such index [unknown]\nFor more details, please send request for Json format to see the raw response from OpenSearch engine.",
    "type": "IndexNotFoundException"

New:

  "error": {
    "reason": "Error occurred in OpenSearch engine: no such index [unknown]",
    "details": "[unknown] IndexNotFoundException[no such index [unknown]]\nFor more details, please send request for Json format to see the raw response from OpenSearch engine.",
    "type": "IndexNotFoundException"

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #1662 (5f130fb) into main (8e5d766) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #1662   +/-   ##
=========================================
  Coverage     97.16%   97.16%           
  Complexity     4120     4120           
=========================================
  Files           371      371           
  Lines         10373    10373           
  Branches        704      704           
=========================================
  Hits          10079    10079           
  Misses          287      287           
  Partials          7        7           

Flag	Coverage Δ
sql-engine	97.16% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.