Fix silent restore failures and broken reconciliation in elastic-reindex.sh

[Balatripura587]

Type of change

• Refactor
• New feature
• Bug fix
• Optimization
• Documentation Update

Description

During investigation of missing data in intlab, identified that restore failures in publish_to_destination are silently skipped and the reconciliation check is not accurate.

Changes

• Track restore failures via RESTORE_FAILED flag instead of silently continuing
• Capture elasticdump Total Writes for both backup and restore steps
• Replace broken destination count comparison with backup-vs-restore write verification
• Use exit 1 for failures (triggers Slack alert) instead of exit 3 (treated as success)
• Only write touch file after reconciliation passes

Related Tickets & Documents

• Related Issue #
• Closes #

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.

Testing

• Please describe the System Under Test.
• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.