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- Introduced a parameter for the Backup operation to specify index backup strategy.
- Introduced two strategies for backing up index data.
- One using core Admin API (BACKUPCORE)
- Other skipping the backup of index data altogether. This is useful when
the index data is copied via an external mechanism in combination with named
snapshots (Please refer to SOLR-9038 for details)
- In future we can add additional implementations of this interface (e.g. based on HDFS snapshots etc.)
- Added a backup property to record the Solr version. This helps to check the compatibility
of backup with respect to the current version during the restore operation. This
compatibility check is not added since its unclear what the Solr level compatibility guidelines
are. But at-least having version information as part of the backup would be very useful.