mikemccand commented on PR #15507:
URL: https://github.com/apache/lucene/pull/15507#issuecomment-3666132839

   [Disclaimer: @zihanx and I work together, at Amazon customer facing product 
search]
   
   Thanks @zihanx -- these metrics are really helpful merge intensive indexing. 
 Lucene applies backpressure (halts incoming indexing threads to give merge 
backlog a chance to get back under the hard merge count limit) and you are 
flying blind if there's no way to monitor it.
   
   Could you add `@lucene.experimental` to the API javadocs to make it clear 
it's not necessarily a frozen API?


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