Fix flaky DataFormatAwareReplicaGetByIdIT when zero docs are indexed

[LantaoJin]

Description

testGetByIdFromReplica picked its document count with randomInt(20), which is inclusive of 0. On the (~1-in-21) runs where it rolled 0, the test indexed no documents and then failed in assertCatalogSnapshotsConverged(...).
With 0 docs, the index only ever produces a segments_N commit file. assertCatalogSnapshotsConverged calls assertLuceneIndexDirContents, which — because this suite runs with a Lucene secondary format (hasLuceneSecondary() returns true) — asserts the shard's index/ directory contains segment data files beyond segments_N (.si, .cfs, etc.). An empty index never writes those, so the assertion tripped:

parquet+lucene: index/ must have segment data files beyond segments_N, got [segments_N, write.lock]

The failure was purely a function of the random seed, making it an intermittent (flaky) failure rather than a real regression in the replica get-by-id path.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

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[github-actions]

❕ Gradle check result for f24dd04: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.38%. Comparing base (1e31adf) to head (f24dd04).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #22365      +/-   ##
============================================
+ Coverage     73.34%   73.38%   +0.04%     
- Complexity    76017    76062      +45     
============================================
  Files          6076     6076              
  Lines        345507   345508       +1     
  Branches      49732    49732              
============================================
+ Hits         253409   253568     +159     
+ Misses        71869    71744     -125     
+ Partials      20229    20196      -33     

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