Address build failures

[MaxKsyunz]

Xcontent classes were moved in this PR opensearch-project/OpenSearch#5902 causing builds to fail.

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[codecov-commenter]

Codecov Report

Merging #367 (f7908d0) into main (3869c74) will decrease coverage by 0.04%.
The diff coverage is 33.33%.

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@@             Coverage Diff              @@
##               main     #367      +/-   ##
============================================
- Coverage     73.30%   73.27%   -0.04%     
- Complexity      698      699       +1     
============================================
  Files           110      110              
  Lines          4612     4614       +2     
  Branches        606      608       +2     
============================================
  Hits           3381     3381              
  Misses          980      980              
- Partials        251      253       +2     

Impacted Files	Coverage Δ
...ain/java/org/opensearch/commons/authuser/User.java	87.82% <ø> (ø)
...ommons/alerting/action/AcknowledgeAlertResponse.kt	41.66% <ø> (ø)
...h/commons/alerting/action/DeleteMonitorResponse.kt	20.00% <ø> (ø)
...earch/commons/alerting/action/GetAlertsResponse.kt	100.00% <ø> (ø)
...rch/commons/alerting/action/GetFindingsResponse.kt	70.83% <ø> (ø)
...ch/commons/alerting/action/IndexMonitorResponse.kt	66.66% <ø> (ø)
...selectorext/BucketSelectorExtAggregationBuilder.kt	46.03% <ø> (ø)
...ation/bucketselectorext/BucketSelectorExtFilter.kt	40.00% <ø> (ø)
...egation/bucketselectorext/BucketSelectorIndices.kt	0.00% <ø> (ø)
...g/opensearch/commons/alerting/alerts/AlertError.kt	31.81% <ø> (ø)
... and 65 more

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[peternied]

Thank you @MaxKsyunz !

[MaxKsyunz]

@peternied @lezzago could you label this PR with backport to 2.x?

Now that XContent refactor is in OpenSearch 2.x, common-utils 2.x build fails. I confirmed locally that backporting these changes is sufficient to make it build again.

[rupal-bq]

Now that XContent refactor is in OpenSearch 2.x, common-utils 2.x build fails. I confirmed locally that backporting these changes is sufficient to make it build again.

@MaxKsyunz Looks like this is addressed in #392