houserjohn commented on issue #14431:
URL: https://github.com/apache/lucene/issues/14431#issuecomment-2779350159

   Apologies if I am misunderstanding your question, but the example that it is 
great for is right after the full indexing of your documents. The indexing 
likely created many deletes during the process which can accumulate and affect 
performance over time. If we use `forceMergeDeletes` we can address this issue 
before we finish the full indexing stage. If we do not wait, then this problem 
will carry on past our full indexing step, which may not be ideal for some use 
cases. Without a timeout you have less control over how long your full indexing 
step takes, and some deletes being addressed is better than none.


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