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The maximum amount of extra disk space that the server is allowed to use to improve the compaction. This value is additionally capped to twice the size of the largest document in the index. For example, if you allow the server 32KB of extra compaction disk space, but the largest document on disk is only 10KB, the server uses only an additional 20KB. If, however, the largest document was 30KB, the compact operation continues, but it might not save as much space at the end of the operation.
You can set this parameter after you change the value of the NodeTableCompression configuration parameter to trigger a compression upgrade.