slow-J opened a new pull request, #12797:
URL: https://github.com/apache/lucene/pull/12797

   Closes #11023 
   
   I found this old issue and reached out to Zach @zacharymorn, who said that 
he doesn't plan on picking it up currently so I had a go at tackling this.
   
   CheckIndex - Making -fast the default behaviour
   
   1. Making -fast the new default.
   2. The previous -slow is moved to -slower
   3. The previous default behavior (checksum + segment file content) is 
activated by -slow.
   
   
   ### Test
   
   Command executed: `java  -server -Xms2g -Xmx2g --add-modules 
jdk.incubator.vector -XX:+HeapDumpOnOutOfMemoryError -XX:+UseParallelGC  
-classpath ./lucene/core/build/libs/lucene-core-10.0.0-SNAPSHOT.jar -ea 
org.apache.lucene.index.CheckIndex -threadCount 16 myindex_dir/index`
   
   Default: `Took 1.379 sec total.`
   Slow: `Took 74.824 sec total.`
   Slower: `Took 136.988 sec total.`
   


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