Migration Concept El Alto → Frankfurt

Export Dublin/ El Alto: Bash script to read data from ES V2 database and write to a backupfile.
Import Frankfurt:
- SDNC-Cluster status migration status:
  - Migration is like re-installing a backup and fills data into database.
  - User is responsible to have SDNC cluster in approppriate status to receive backup/migration data
- Backupfile needs to be moved by user process into daexim folder of Kubernetes/SDNC Cluster, that they are available during runtime
- RESTCONF/RPC migration start/stop
  - Import runns as job in the background
  - Command with parameter "backup-filename" to start migration.
    - Response: 200 OK If job is accepted
    - Response: 4xx if not acceped (e.g. already running or file not found or invalid)
  - Event-log will show indication for "start", "success" and "failures/warnings"

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