[Backport 2.x] Allow mapping service to be null for scenarios of shard recovery from translog

[opensearch-trigger-bot]

Backport c412c8a from #685

[codecov-commenter]

Codecov Report

Merging #687 (c412c8a) into 2.x (144a5e8) will decrease coverage by 0.03%.
The diff coverage is 85.60%.

❗ Current head c412c8a differs from pull request most recent head 0766ad1. Consider uploading reports for the commit 0766ad1 to get more accurate results

@@             Coverage Diff              @@
##                2.x     #687      +/-   ##
============================================
- Coverage     84.50%   84.46%   -0.04%     
+ Complexity     1059     1055       -4     
============================================
  Files           149      149              
  Lines          4317     4307      -10     
  Branches        388      385       -3     
============================================
- Hits           3648     3638      -10     
  Misses          489      489              
  Partials        180      180              

Impacted Files	Coverage Δ
...n/java/org/opensearch/knn/common/KNNConstants.java	93.33% <ø> (ø)
.../main/java/org/opensearch/knn/index/IndexUtil.java	55.73% <ø> (ø)
...va/org/opensearch/knn/index/KNNCircuitBreaker.java	60.00% <0.00%> (ø)
.../main/java/org/opensearch/knn/index/KNNMethod.java	100.00% <ø> (ø)
...ava/org/opensearch/knn/index/KNNMethodContext.java	92.50% <ø> (ø)
...java/org/opensearch/knn/index/MethodComponent.java	88.88% <ø> (ø)
...g/opensearch/knn/index/MethodComponentContext.java	91.13% <ø> (ø)
...earch/knn/index/memory/NativeMemoryAllocation.java	82.92% <ø> (ø)
.../java/org/opensearch/knn/index/query/KNNQuery.java	83.33% <ø> (ø)
...org/opensearch/knn/index/query/KNNQueryResult.java	100.00% <ø> (ø)
... and 84 more

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[opensearch-trigger-bot]

The backport to 2.3 failed:

The process '/usr/bin/git' failed with exit code 1

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-2.3 2.3
# Navigate to the new working tree
cd .worktrees/backport-2.3
# Create a new branch
git switch --create backport/backport-687-to-2.3
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 04f677ef457317832144b71d155276e4af7360ec
# Push it to GitHub
git push --set-upstream origin backport/backport-687-to-2.3
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.3

Then, create a pull request where the base branch is 2.3 and the compare/head branch is backport/backport-687-to-2.3.

[opensearch-trigger-bot]

The backport to 2.2 failed:

The process '/usr/bin/git' failed with exit code 1

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-2.2 2.2
# Navigate to the new working tree
cd .worktrees/backport-2.2
# Create a new branch
git switch --create backport/backport-687-to-2.2
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 04f677ef457317832144b71d155276e4af7360ec
# Push it to GitHub
git push --set-upstream origin backport/backport-687-to-2.2
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.2

Then, create a pull request where the base branch is 2.2 and the compare/head branch is backport/backport-687-to-2.2.