[Refactor] Requests to use MediaType instead of XContentType

[nknize]

Refactors various REST requests to use MediaType instead of XContentType to abstract media format from the REST interfaces.

relates #5910

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/10776/
• CommitID: c5f0c89
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/10779/
• CommitID: 739d524
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/10782/
• CommitID: 986a83d

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/10840/
• CommitID: 6978118
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/10841/
• CommitID: ded5906

[codecov-commenter]

Codecov Report

Merging #6218 (ded5906) into main (2b77985) will decrease coverage by 0.06%.
The diff coverage is 43.47%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@             Coverage Diff              @@
##               main    #6218      +/-   ##
============================================
- Coverage     70.91%   70.86%   -0.06%     
- Complexity    58898    58915      +17     
============================================
  Files          4780     4780              
  Lines        281380   281453      +73     
  Branches      40635    40639       +4     
============================================
- Hits         199536   199444      -92     
- Misses        65426    65633     +207     
+ Partials      16418    16376      -42     

Impacted Files	Coverage Δ
.../java/org/opensearch/common/xcontent/XContent.java	100.00% <ø> (ø)
...rg/opensearch/common/xcontent/XContentFactory.java	64.15% <ø> (+0.94%)	⬆️
.../opensearch/common/xcontent/XContentGenerator.java	73.33% <ø> (ø)
...a/org/opensearch/common/xcontent/XContentType.java	100.00% <ø> (ø)
.../opensearch/common/xcontent/cbor/CborXContent.java	80.00% <ø> (ø)
.../opensearch/common/xcontent/json/JsonXContent.java	100.00% <ø> (ø)
...pensearch/common/xcontent/smile/SmileXContent.java	87.50% <ø> (ø)
.../opensearch/common/xcontent/yaml/YamlXContent.java	84.61% <ø> (ø)
...ction/admin/indices/create/CreateIndexRequest.java	66.22% <0.00%> (-9.32%)	⬇️
...g/opensearch/action/ingest/PutPipelineRequest.java	67.74% <0.00%> (-19.76%)	⬇️
... and 514 more

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/10844/
• CommitID: 2f0ec23

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-6218-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 1f4cdd2f75ca5e98bd81f3226566d263ec00455c
# Push it to GitHub
git push --set-upstream origin backport/backport-6218-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-6218-to-2.x.

[andrross]

@nknize Is this going to be backported? It builds on some changes from #6009 which has not been backported. I spent a couple minutes looking at it and it wasn't immediately obvious to me how to reconcile the changes.

[nknize]

Yes. I'll take care of both.