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Discussion thread: https://mail-archives.apache.org/mod_mbox/lucene-dev/201912.mbox/%3cC75FB0F5-3397-4175-B4D6-8E31120C795A@gmail.com%3e
JIRA: JiraserverASF JIRAserverId5aa69414-a9e9-3523-82ec-879b028fb15bkeySOLR-14116

JIRAs: Before carrying this forward, please look at the discussions at these JIRAs.

• SOLR-12259: Robustly upgrade indexes     
• SOLR-14116: Support safe index modifications without re-indexing

Released: None

Motivation

There are certain situations in which modifying an existing index is necessary and re-indexing from the system-of-record is either undesirable or impossible. This is a proposal to allow certain "safe" operations to be added to Solr, possibly as a package or contrib out of the box.

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