Author: Peter Smith
Discussion: https://postgr.es/m/CAHut+Pu-V22PiJF2ym9_NVZe-+qnycfyEX24dZm=7URWhDHJ3w@mail.gmail.com
these operations.
CREATE INDEX writes multiple WAL records. First, we write a record to cover
-the initializatoin of the metapage, followed by one for each new bucket
+the initialization of the metapage, followed by one for each new bucket
created, followed by one for the initial bitmap page. It's not important for
index creation to appear atomic, because the index isn't yet visible to any
other transaction, and the creating transaction will roll back in the event of