Issue 19271: Fix DerivedFieldScript to support emitting Float type

[ishag4]

Description

This change addresses a bug in DerivedFieldScript where emitting Float values was not supported, even though the official OpenSearch documentation lists Float as a valid type for derived field scripts.

Issue: The getObjectByteSize method in DerivedFieldScript only accounted for Double, Integer, Long, Boolean, String, and Tuple types. Emitting a Float previously caused an IllegalArgumentException.

Fix: Added support for Float in getObjectByteSize so that scripts emitting Float values are handled correctly without errors.

Tests: A new test testEmittingFloatField has been added in DerivedFieldScriptTests to verify that Float values can be emitted successfully. Existing tests for Double, GeoPoint, multiple values, and byte-size limit continue to pass.

Related Issues

Resolves #19271

Check List

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

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[rishabhmaurya]

@ishag4 thank you for fixing it

[github-actions]

❌ Gradle check result for 6566be6: 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 094b6ea: 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 5198dd4: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.00%. Comparing base (7e0c6ea) to head (5198dd4).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19303      +/-   ##
============================================
+ Coverage     72.96%   73.00%   +0.03%     
- Complexity    69825    69829       +4     
============================================
  Files          5667     5667              
  Lines        320555   320557       +2     
  Branches      46348    46349       +1     
============================================
+ Hits         233908   234008     +100     
+ Misses        67769    67644     -125     
- Partials      18878    18905      +27     

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