Fix a flaky test that forces materialization to hit cache

[liuguoqingfz]

Description

IndexFieldData#load(LeafReaderContext) does not always build and insert the heavy field-data into the shared cache immediately. For some field types/implementations it returns a lightweight wrapper that defers the expensive build until you actually access the values, or until a global/agg path forces construction.

Related Issues

Resolves #19730

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]

❌ Gradle check result for e931bbc: null

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 result for 5e91d97: FAILURE

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 result for 5e91d97: FAILURE

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 result for 86b2ece: 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 73.10%. Comparing base (cb9c30b) to head (86b2ece).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19759      +/-   ##
============================================
- Coverage     73.12%   73.10%   -0.03%     
+ Complexity    70973    70937      -36     
============================================
  Files          5737     5737              
  Lines        324767   324767              
  Branches      46982    46982              
============================================
- Hits         237483   237405      -78     
- Misses        68151    68264     +113     
+ Partials      19133    19098      -35     

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