Add record descriptor name to Elastic writer exception message

[JSCU-CNI]

This PR improves the exception message thrown when the Elastic adapter attempts to write documents that get rejected by the remote Elasticsearch server.

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.50%. Comparing base (9775ddb) to head (f3906ff).

Files with missing lines	Patch %	Lines
flow/record/adapter/elastic.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   82.25%   83.50%   +1.25%     
==========================================
  Files          34       34              
  Lines        3652     3608      -44     
==========================================
+ Hits         3004     3013       +9     
+ Misses        648      595      -53     

Flag	Coverage Δ
unittests	83.50% <77.77%> (+1.25%)	⬆️

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[yunzheng]

Oops, I remember reviewing this PR but it seems I forgot to add my actual review notes.

I was thinking maybe we can use Exception.add_note() here, that could be more clean. See also:

• https://docs.python.org/3/tutorial/errors.html#enriching-exceptions-with-notes
• https://daniel.feldroy.com/posts/til-2025-05-exception-add_note

However, this is a feature introduced in Python 3.11 but we still support Python 3.10 until EOL (2026-10). Luckily there is a backport package called exceptiongroup that we can use until we drop support.

Is this something you can explore for this PR? If not, i'm also happy to check.