We are in Pega Cloud at version 8.3.1. Can someone answer how the System would kickoff reindexing? I know after cluster restarts, or Util node restarts, the system initiates reindexing but in our case yesterday it kicked off by itself.
Using the below setting, Reindexing on index host nodes is triggered automatically when no other index node exists in the cluster, eliminating the need for us to manually clean up old items and start reindexing.
Apart from the index nodes leaving the cluster & restarts. The reindex can get triggered when the index directory is changed / index data is lost inside it OR someone might have manually triggered the reindex from the search landing page.
You can share if you find anything interesting in the PegaRULES log.