Simon Willnauer created LUCENE-8246:

             Summary: Allow to customize the number of deletes a merge claims
                 Key: LUCENE-8246
             Project: Lucene - Core
          Issue Type: Improvement
    Affects Versions: 7.4, master (8.0)
            Reporter: Simon Willnauer
             Fix For: 7.4, master (8.0)

With the introduction of soft deletes no every merge claims all documents that 
are marked as deleted in the segment readers. MergePolicies still need to do 
accurate accounting in order to select segments for merging and need to decide 
if segments are merged. This chance allows the merge policy to customize the 
number of deletes a merge of a segment claims.

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