Aggregation precomputation missing terms

[ajleong623]

Description

This is the pull request for using aggregation precomputation on missing terms. This is part of pull request #18927.

Related Issues

Resolves #13122

Check List

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

✅ Gradle check result for ffdaac8: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.98%. Comparing base (d3252cd) to head (ffdaac8).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...aggregations/bucket/missing/MissingAggregator.java	76.92%	2 Missing and 4 partials ⚠️
...rch/search/aggregations/support/MissingValues.java	50.00%	1 Missing ⚠️
...arch/search/aggregations/support/ValuesSource.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19627      +/-   ##
============================================
- Coverage     73.12%   72.98%   -0.14%     
+ Complexity    70662    70589      -73     
============================================
  Files          5723     5723              
  Lines        323516   323474      -42     
  Branches      46852    46852              
============================================
- Hits         236558   236075     -483     
- Misses        67930    68317     +387     
- Partials      19028    19082      +54     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.