I am using Elasticsearch version 7.8.0.
I have opened this thread for my understanding in regards to Elasticsearch internal operations.
A Cluster Version : 18.104.22.168
B Cluster Version : 22.214.171.124
We are not using Complex Structures / MAPPINGS .. NO PIPLES / INJEST / DYNAMIC MAPPINGS.
We have mapping indexes already created in B Cluster and then performing re-indexing.
We are using TEXT , DATE , NUMBER Data types only.
I have observed :
- When I do Reindexing from A Cluster to B Cluster .. for Index of Size PRIMARY -5 SHARDS [ 12.5 GB ] .. It takes 80-90 minutes.
Network is same / subnet is same .. only two different clusters...
- If I do RE-ALLOCATION of Shards Within B Cluster
I do increase replicas to 1 , from initial 0 during re-indexing ..
Its super fast ... less than 7-8 mins it completes..
Storage on both Cluster is SAME.
Could you please help me in its understanding..