Still preparing an migration from elastic to opensearch. run some testing and it seems the need to bring our dataminer cluster down for approx 8 hours to just reindex the database.
two questions:
1) can i delete indices not being just anymore without issue? (for instance the Job manager ones: dms-cjobsectiondefinition, and for instance suggestions alarm older like dms-suggest-alarms-2021.07.30.05-000013 for instance.)
2) since monitoring/data loss will be inevitable (dataminer down for 8 hoursa). can't i just start the migration process, then cut over to opensearch meaning that dataminer will go back to the data from the moment the snapshot is taken. Or will this cause issues with the cassandra database for instance?
When I tested this, I did the following steps
1.) Take a snapshot
2.) Restore the snapshot onto Elastic 7.12 running in a Docker container (Opensearch requires the indexes to be in Elastic 7.12 format, 6.xx indexes won't work)
3.) use the reindex tool against this
4.) take a snapshot of the reindexed database
5.) Restore the 2nd snapshot to Opensearch