jpountz opened a new issue, #13211:
URL: https://github.com/apache/lucene/issues/13211

   ### Description
   
   `MergeContext` has a few boolean flags: `readOnce`, `load`, `randomAccess`. 
But some combinations of these flags don't make sense, e.g. something can't be 
`readOnce` and `randomAccess` at the same time. So it would be natural to 
identify combinations that make sense and represent them as an `enum`.
   
   Separately @rmuir suggested having a more natural translation between 
`IOContext` and `(m|f)advise`. So maybe this enum could be modeled after the 
allowed values for `posix_fadvise`:  `NOREUSE` (read-once), `RANDOM`, etc.


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