Rahul Goswami created SOLR-18096:
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             Summary: Introduce a UPRADECOREINDEX CoreAdmin API to support 
index upgrade
                 Key: SOLR-18096
                 URL: https://issues.apache.org/jira/browse/SOLR-18096
             Project: Solr
          Issue Type: Improvement
            Reporter: Rahul Goswami


Forking this JIRA from parent SOLR-1775 based on [~dsmiley]'s suggestion. The 
merge policy (LatestVersionMergePolicy) part of the overall enhancement made it 
into Solr 10 which enables uses to still be able to upgrade their index for the 
next Solr version (Solr 11), although with more write overhead.

The other part of the enhancement is this JIRA which proposes exposing an 
UPRADECOREINDEX CoreAdmin API for standalone installations to be able to 
achieve the upgrade in a highly targeted and efficient way by only upgrading 
older segments and abstracting the setting of the merge policy. 



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