Indexing Service Flooding The System Event Log with 10000 Errors

The System Event Log provides an important timeline to get a high-level overview of what's occurring on the system. We rely on components using judicious use of this facility.
ERROR level should be reserved for the occasional catastrophic failures
Spamming the system event log results in an unusable artefact.

In the attached set of customer logs, we saw many thousand of the following type of error, meaning we were unable to derive a picture of what had occurred:

2023-07-05T15:49:30.876Z	

error	

indexing	Index Instance or Partition Error State Change	

{ "definition_id": 15810499631867759000, "error_string": "idx_name_redacted will retry building in the background for reason: Build Already In Progress. Keyspace PROD:_default:redacted.", "group": "DDL", "indexer_id": "d33ecfceaab4295e9c24db93e8ee19e8", "instance_id": 4081695301407191600, "module": "IndexErrorStateChange", "partition_id": 8, "replica_id": 1 }