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https://issues.apache.org/jira/browse/SOLR-18096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18055728#comment-18055728
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ASF subversion and git services commented on SOLR-18096:
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Commit deeb7200f1ddd68171c475fc338ef11504204a97 in solr's branch
refs/heads/branch_10x from Rahul Goswami
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=deeb7200f1d ]
SOLR-18096: /admin/cores?action=UPGRADECOREINDEX (#3903)
Provides a /admin/cores api (action=UPGRADECOREINDEX) to upgrade older index
segments to the latest version (by targeted reindexing). Calling this endpoint
on an index created in version X-1 (assuming you are on Solr version X) would
reindex documents in any segments of the older version (X-1) creating new
segments, resulting in the old ones getting deleted. This would help prepare
the index for when Solr is upgraded to X+1 without having to recreate the index
from source (as is the requirement today).
Various limitations apply.
> 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
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Forking this JIRA from parent SOLR-17725 based on [~dsmiley]'s suggestion.
> The merge policy (LatestVersionMergePolicy) part of the overall enhancement
> made it into Solr 10 as part of SOLR-17725 which enables users to be able to
> upgrade their index for the next Solr version (Solr 11), although with more
> write overhead and manual steps.
> The other part of the enhancement is this JIRA which proposes exposing an
> UPGRADECOREINDEX 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 abstracts the setting/unsetting of the merge policy.
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