Improve storage footprint for text field under derived source and handle ig…

[tanik98]

• For keyword field handle ignore_above by explicitly storing values exceeding that and using stored field for using it as a fallback
• For text field, use sub keyword fields for deriving source(using doc_values) instead of explicitly storing the value, this way we can avoid storing duplicates(as a doc_values under sub keyword and stored field under text field).

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[github-actions]

❌ Gradle check result for e4707a1: 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?

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❌ Gradle check result for 6ad1447: 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?