Maxwell-Guo commented on code in PR #2433:
URL: https://github.com/apache/cassandra/pull/2433#discussion_r1243063351


##########
conf/cassandra.yaml:
##########
@@ -1956,6 +1956,15 @@ drop_compact_storage_enabled: false
 # if zero_ttl_on_twcs_enabled is set to false, this property is irrelevant as 
such statements will fail.
 #zero_ttl_on_twcs_warned: true
 
+# The default secondary index implementation when CREATE INDEX does not 
specify one via USING.
+# ex. "cassandra" - (default) traditional secondary index, implemented as a 
hidden table attached to the primary table
+# ex. "sai" - storage-attched index, implemented via optimized 
SSTable/Memtable-attached indexes

Review Comment:
   Thank you for explaining @maedhroz , so what about add a corresponding 
description to this document? This way, users may understand that the old 
usage(CREATE CUSTOM INDEX) is still possible.



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