chatman commented on issue #15296:
URL: https://github.com/apache/lucene/issues/15296#issuecomment-3383133498

   > That limit prevents new (aka "flushed") segments from being larger than 
2GB. It doesn't prevent larger segments (via merges). That limit is governed by 
setMaxMergedSegmentMB (default is 5GB; consider raising this).
   
   During bulk ingestion of vectors, if someone is not in a memory constrained 
environment, it is better to flush larger segments (>2GB) than creating several 
small segments and merging them up to become large segments.
   
   As an example, 1M documents with a 2048 dimension vector, would take up 8GB. 
It is arguably more efficient to write this segment at once than creating 
several smaller segments and merging them up to become a 8GB segment.


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