If you reindex into a monthly index, you can skip the shrinking operation. It will reduce the shard count even more and probably be more efficient in your case. Also make sure that you configure Filebeat to start writing to monthly indices.
I think I messed up my indices. Well I have a backup but it's a week ago. How can I migrate/move the data from my old elasticsearch server to my new elasticsearch server?
You can perform a reindex from remote.
How about a specific data only? example from jan 16-30 only?
I am not sure I understand what you mean.
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