[improve] Upgrade opensearch sink to client 2.16 and tests to use server 2.16.0

[dlg99]

Motivation

Support OpenSearch 2.16.0

Modifications

Upgraded opensearch sink to client 2.16 and updated tests to use server 2.16.0

Verifying this change

This change is already covered by existing tests, such as Pilsar-IO integration tests.

Does this pull request potentially affect one of the following parts:

OpenSearch client is upgraded to v.2.16.0, this only affects OpenSearch sink

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Already documented

Matching PR in forked repository

PR in forked repository: dlg99#20

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.54%. Comparing base (bbc6224) to head (fb3397c).
Report is 586 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #23312      +/-   ##
============================================
+ Coverage     73.57%   74.54%   +0.97%     
- Complexity    32624    34294    +1670     
============================================
  Files          1877     1927      +50     
  Lines        139502   145043    +5541     
  Branches      15299    15863     +564     
============================================
+ Hits         102638   108129    +5491     
+ Misses        28908    28635     -273     
- Partials       7956     8279     +323     

Flag	Coverage Δ
inttests	27.89% <ø> (+3.30%)	⬆️
systests	24.72% <0.00%> (+0.39%)	⬆️
unittests	73.89% <100.00%> (+1.04%)	⬆️

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

Files with missing lines	Coverage Δ
...e/pulsar/io/elasticsearch/ElasticSearchConfig.java	89.83% <100.00%> (-0.85%)	⬇️
...ient/opensearch/OpenSearchHighLevelRestClient.java	88.02% <ø> (-0.25%)	⬇️

... and 567 files with indirect coverage changes

[lhotari]

LGTM

[jcmfernandes]

This means that we can update https://pulsar.apache.org/docs/next/io-elasticsearch-sink/ as Pulsar can now use ES 8 and OS 2, right?