Hrishikesh Gadre created SOLR-9642:

             Summary: Refactor the core level snapshot cleanup mechanism to 
rely on Lucene
                 Key: SOLR-9642
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 6.2
            Reporter: Hrishikesh Gadre

SOLR-9269 introduced a mechanism to create/delete snapshots for a Solr core 
(using Lucene IndexDeletionPolicy). The current snapshot cleanup mechanism is 
based on reference counting the index files shared between multiple segments. 
Since this mechanism completely skips the Lucene APIs, it is not portable (e.g. 
it doesn't work on 4.10.3 version).

I propose an alternative implementation which relies exclusively on Lucene 
IndexWriter (+ IndexDeletionPolicy) for cleanup.

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