iverase opened a new pull request #462:
URL: https://github.com/apache/lucene/pull/462


   In pre-8.6 indexes, high dimensional trees (numDims > 1) were constructed as 
fully balanced trees but the BKD reader always assumes that trees are 
unbalanced as it is the case from Lucene 8.6 onwards. Note as well that in 
Lucene 8.6 we added a new Points Format codec and therefore this sure only 
shows on the Lucene 60 codec.
   
   In order to test the change, I ported the BKD writer from Lucene 8.5 to the 
backwards codec in order to build balanced trees. 
   
   While fixing this,  I discover that the SimpleTextBKDtree is always balance 
and it is fixed as well.


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