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df73ca3514
Clearly spell out the limitations of aminsert()'s indexUnchanged hinting mechanism in the index AM documentation. Oversight in commit 9dc718bd, which added the "logically unchanged index" hint (which is used to trigger bottom-up index deletion). Author: Peter Geoghegan <pg@bowt.ie> Reported-By: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAH2-WzmU_BQ=-H9L+bxTSMQBqHMjp1DSwGypvL0gKs+dTOfkKg@mail.gmail.com Backpatch: 14-, where indexUnchanged hinting was introduced.