Adrien Grand created LUCENE-8166:

             Summary: Require merge instances to be consumed in the thread that 
created them
                 Key: LUCENE-8166
             Project: Lucene - Core
          Issue Type: Task
            Reporter: Adrien Grand

I would like to improve AssertingCodec to add the restriction that merge 
instances can only be consumed from the thread that pulled them. This is 
something that I relied on in order to avoid cloning index inputs too much when 
implementing LUCENE-4198, but this is neither documented nor checked.

For the record, I found that it was already an issue before LUCENE-4198 was 
merged, for instance if you would pull a merge instance of the default stored 
fields reader and clone it (for use in another thread), it would no longer be a 
merge instance. So I think this new restriction makes sense?

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